Image source, EPA

Before we go, we've rounded up some key details from our reporting today to give you a full picture of the conflict as it stands:

• Biden told world leaders at the G20 summit, in Brazil, that his administration "strongly supportsUkraine's sovereignty and territorial integrity", in the aftermath of his reported authorisation of Ukraine's use of US long-range missiles
• Russia has promised an "appropriate" response if Ukraine does choose to use long-range missiles to strike its territory. United Russia MP Maria Butina said the US is "actually pushing the world to a very dangerous red line"

• Not all nations are on board with Biden: Hungary, Slovakia and Italy have voiced their opposition to the decision
• Other Western powers have yet to follow Washington's lead. France and the UK have maintained that Storm Shadow missiles supplied by them can only be used on targets in Ukraine
• A Russian missile strike on an apartment building in the Ukrainian port city of Odesa killed at least 10 people and injured 47 others, according to local authorities. In Sumy, a city in Ukraine's northwest, 11 people were killed and 63 injured in a Russian missile strike on a residential area

We're now ending our live coverage, there is more on this story here and you can find more content from across the BBC in our post below.

We're going to be closing out live coverage soon, but there's plenty more to read elsewhere for more insight on what's happened today:

• Biden's effort to help Ukraine: Reports say that US President Biden has allowed Ukraine to use long-range missiles to strike Russia, the BBC looked into how these missiles could affect the war
• Anger among Trump allies:For some analysis, we have this piece on how the outgoing president's decision has stirred up incoming president Donald Trump's allies
• North Korean troops in Ukraine: After the US and Ukraine revealed North Korean troops have been engaged in combat with Ukrainian soldiers, this is what we know about their involvement

• Will the UK follow the US? BBC's defence correspondent Jonathan Beale unpacks what the UK could decide on Storm Shadow missiles provided by Britain
• Weapons being given to Ukraine: For a closer look, there's this piece on what weapons are being supplied to Ukraine from different countries
• The scale of the conflict, in maps and graphics: The BBC's Visual Journalism team has produced a piece on the recent significant events and situation in Ukraine

Analysis conducted by an international chemical weapons watchdog has found banned CS riot gas in samples provided by Ukraine.

In a statement, the Hague-based Organisation for the Prohibition of Chemical Weapons says: "The results of the analyses of these samples conducted by two OPCW designated laboratories... indicate that both a grenade and a soil sample... contained the riot control agent known as CS".

CS riot gas - commonly known as teargas – is banned for use in warfare under the Geneva Protocol, but is often deployed as a riot control measure.

Image source, Reuters

As Biden's authorisation of Ukraine's use of US long-range missiles inside Russia has caused an international reaction, the BBC's Visual Journalism team has looked at the scale of the conflict as it stands nearly three years into the war.

Fighting has raged in Ukraine since Russia launched a full-scale invasion in February 2022. Russian forces have slowly expanded the amount of territory they control over the last year, mostly in the east of Ukraine, but Ukrainian forces have made those advances as slow and difficult as possible and even staged a counter-offensive into Russian territory.

Here is a recap of recent significant events and the situation in Ukraine.

Grigor Atanesian
BBC News Russian

Image source, EPA

On Monday, Russian officials and pro-government pundits called the reported change in the US position reckless and escalatory.

While threatening Ukraine and the West with retribution, they also sought to downplay the significance of the move, saying Russian air defences were well-trained to destroy Western missiles.

Russia’s President Vladimir Putin is yet to comment on the US's reported decision on long-range missile use. However, his previous remarks set the tone for the Russian response.

Kremlin spokesperson Dmitry Peskov reiterated that Putin had previously equated potential strikes on the Russian territory with the involvement of the US and Nato in the conflict.

Duma (Parliament) speaker Vyacheslav Volodin said Moscow could now use “new weapon systems that had not yet been used by Russia to strike Ukraine” - predicting this will result in further escalation.

Alexander Kots, a pro-war influencer, wrote in a piece for the Komsomolskaya Pravda tabloid, external, “will the new authorisation help Kyiv defeat Russia? Of course not.”

As it often happens in Russia, this range of opinion reflects a level of uncertainty about the official response before Mr Putin gives his verdict.

Bernd Debusmann Jr
Reporting from the State Department

I'm currently at the State Department briefing in Washington DC, where spokesman Matt Miller has declined to confirm reports that the US has given a green light for Ukraine to use US-supplied missiles to strike targets inside Russia.

While Miller told reporters that the US has long said it would help Ukraine "adjust" its capabilities based on wartime conditions in Ukraine.

As we've so far seen with other US officials - who have similarly declined to comment about the missiles - Miller pointed to Russia's "aggression" in Ukraine as the primary issue, rather than any US policy shift.

Miller was asked about how typical - or atypical - it would be for a presidential administration to take such a significant policy decision in its final months, Miller said that Biden was "elected to a four year-term, not a term of three years and 10 months."

"We will use every day of our term to pursue policy interests that we believe are in the interests of the American people," he said. "If the incoming administration wants to take a different view, that is, of course, their right to do so."

"There is no one who thinks for for the first two months of the next term they're supposed to continue to carry out the decisions by this president. That's now how presidential terms work," he said. "There's one president at a time. When the next president takes office, he can make his own decisions."

Image source, Reuters

German Chancellor Olaf Sholz has defended his decision to call Russian President Vladimir Putin on Friday, telling reporters " it was and still is the right thing to do".

Speaking to reporters at the G20 summit in Brazil, Scholz says he called Putin "because this must be made clear to him: He has a responsibility. He must end the war..."

Discussions at leadership level must take place for this to happen, he adds.

He also says he has "explained very clearly" why he thinks its right to not send Taurus missiles to Ukraine, adding that the missiles could only be used if "responsibility for targeting" was shared, and it is not something he can "take responsibility for".

He says: "We have a clear understanding that the powerful weapons we have supplied so far, the long-range artillery, the rocket launchers, cannot be used to penetrate deep into the Russian hinterland."

The chief of staff of the National Security Council under Donald Trump's last presidency, Fred Fleitz, says President Biden is "sabotaging" Trump's plan to end the war by permitting the use of long-range missiles in Russia.

"We know Trump wants a quick ceasefire and peace talks. But this is going to escalate the conflict and infuriate the Russians," Fleitz tells BBC Radio 4's PM programme.

Citing Russia's warning that this use of missiles would represent Nato's "direct participation" in the war, Fleitz says: "I can only conclude Biden is trying to sabotage Trump's peace efforts because he does not want the negotiated peace that Trump is pushing for."

He says Biden is "sticking to his idyllic version" of removing all Russian troops from Ukraine and holding President Putin accountable.

Asked about Trump's plans, Fleitz says Trump is "giving a lot of thought" to how he can end the war – “maybe before he is inaugurated” in January.

Is President Biden’s decision to allow Ukraine to use long-range missiles to strike Russia a last-ditch effort to help before Donald Trump takes over?

A new Americast Q&A includes US focused analysis of why Biden has approved missile use in Russia.

Listen on BBC Sounds, or wherever you get your podcasts.

As we've been reporting, US President Joe Biden has given the green light for Ukraine to use long-range missiles supplied by the US to strike Russia, US officials say.

While Ukraine has been responding to fresh Russian strikes in the country, here’s the latest:

• Russia has vowed its response will be “appropriate” if Ukraine uses long-range missiles to strike its territory, a foreign ministry spokesperson said earlier
• At the G20 summit in Rio, President Biden said that the US government "strongly supports Ukraine's sovereignty and territorial integrity", without explicitly referring to long-range missiles

• World leaders have continued to react. Hungary’s foreign minister and the Slovakian prime minister both condemned the US's decision and Italy also disagreed. France and the UK have not changed their stance – the Strom Shadow missiles they sent to Kyiv can only be fired at targets inside Ukraine
• Ukraine's air force say a missile shot down by its air defence systems hit Odesa in the south of the country. It killed at least ten people and injured 47 others

• In Sumy, northeastern Ukraine, 11 people have been killed and 63 injured after a Russian missile struck a residential neighbourhood
• Ukrainian President Volodymyr Zelensky visited troops in Pokrovsk, a town on the front line of the conflict and awarded army personnel there

Nick Thorpe
Reporting from Budapest

Image source, Getty Images

The Hungarian Foreign Minister Peter Szijjarto has condemned the decision of the US government to permit the use of long-range weapons against military targets in mainland Russia as "the last desperate attack of pro-war forces against the new reality".

Szijjarto posted his remarks on Facebook, ahead of today’s meeting of EU foreign ministers in Brussels.

"In their final desperation, the pro-war forces do not even seem to be shying away from the worst, that is, from expanding the war in Ukraine to a worldwide scale," he continued.

On Saturday in Paris, Prime Minister Viktor Orban’s governing Fidesz party took part in turning the 84 MEP-strong "Patriots for Europe" parliamentary group in the European Parliament, into a new party.

In a response to Joe Biden's reported decision to give Ukraine permission to fire ATACM missiles into Russia, a Russian foreign ministry spokesperson warns of an "appropriate response" if such missiles are fired into Russian territory.

"Kyiv's use of long-range missiles to attack our territory would represent the direct involvement of the United States and its satellites in hostilities against Russia, as well as a radical change in the essence and nature of the conflict," a statement reads.

"Russia's response in such a case will be appropriate and tangible," it adds.

Adam Easton
Warsaw Correspondent

Polish president Andrzej Duda has said President Biden's reported authorisation to allow Ukraine to use American long-range missiles to strike targets deep inside Russia could be "decisive".

"President Biden's decision was very much needed, and it was good that it was revealed… It is very important, maybe even a decisive moment in this war," Duda said.

"In fact, this is purely and only defensive, allowing Ukraine to more effectively defend itself from Russian aggression," he added.

Duda, like Prime Mnister Donald Tusk did on Sunday, criticised German chancellor Olaf Scholz for calling Vladimir Putin and noted the German media had speculated Berlin may be seeking ways to re-establish energy supply contracts with Moscow.

Damien McGuinness
Berlin correspondent

Image source, Reuters

Arming Ukraine has been a hugely divisive political topic from the moment Russia launched its full invasion. Talk shows and parliamentary debates wrangle over each new type of German tank or missile sent, with politicians accusing each other of either escalation or appeasement.

Olaf Scholz tries to strike the middle ground, where most German voters seem to be: strong support for Ukraine, combined with an attempt to prevent the war spiralling out of control.

Scholz believes supplying the long-range Taurus cruise missile system could drag Germany into the war. His many critics say this fine distinction between individual weapons systems is illogical, especially since Germany is the largest donor of military aid after the US and is already seen as an aggressor by Putin.

But Scholz’s position may have more to do with domestic politics than military logic. He believes reticent non-bellicose rhetoric helps him keep German voters onside.

Scholz, who is struggling in the polls, now faces a snap election in February, and so is likely to double down. In previous campaigns he has portrayed himself as a “peace chancellor”, tapping into his centre-left party’s pacifist heritage.

Over the weekend, he was hugely criticised in Germany for his call to Putin, with critics accusing him of cynically using the issue for domestic political gain by trying to appear like a peacemaker.

But German politics are in flux. The opposition conservatives, who currently have a strong poll lead, want even more military support for Ukraine not less. So Germany’s stance on Taurus may yet change.

Image source, Getty Images

The European Union (EU) has announced fresh sanctions for Iran, as they say it continues to support Russia in the war in Ukraine.

It joins the UK in adding the Islamic Republic of Iran Shipping Lines and its director, Mohammad Reza Khiabani, to its sanctions list.

These sanctions are against vessels and ports they allege are used to transport Iranian weapons to Russia to aid the war effort.

Since the conflict began in 2022, Iran has played a large part in supporting Russia's military, and with that has faced several sanctions.

However, these penalties - that are designed to stop the country acting aggressively or breaking international law - have not been hugely effective.

The US has imposed more than 600 sanctions on Iranian-related entities since Biden took office three years ago, according to the US Treasury.

But in September, the US, UK, France and Germany says Iran supplied Russia with ballistic missiles.

Iran has repeatedly denied supplying such self-guided weapons to Russia, but sanctions, and weapon deliveries, appear to keep coming.

The UK government says it has imposed new sanctions on Iran's national airline and shipping carrier, in response to the country's transfer of ballistic missiles to Russia.

Iran Air and the Islamic Republic of Iran Shipping Lines now face an asset freeze, the UK adds.

It will restrict the airline's commercial services to and from the UK. Russian cargo ship Port Olya-2 has also been sanctioned for transporting missiles from Iran to Russia.

The UK has previously imposed sanctions on Iran for similar matters throughout the war in Ukraine.

• For more on this, David Lammy said back in September that Iranian missiles to Russia change the Ukraine debate

Image source, Getty Images

As we've reported, UK Defence Secretary John Healey says he won't comment on Ukraine's use of Storm Shadow missiles - but what are they and why are they crucial for Ukraine?

• Storm Shadow missiles are cruise missiles with a maximum range of around 250km (155 miles)
• They are launched from aircraft and then fly at close to the speed of sound, hugging the terrain, before dropping down and detonating its high explosive warhead
• They are considered an ideal weapon for penetrating hardened bunkers and ammunition stores
• Britain and France has already sent them to Ukraine - but with the caveat that Kyiv can only fire them at targets inside its borders
• Kyiv argues not being allowed to hit the Russian bases that attacks are launched from is like making it fight with one arm tied behind its back
• They could make a difference,but it may be a case of too little too late, says our security correspondent Frank Gardner

Image source, Getty Images

We can now bring you images showing the aftermath of Russia's strike on Odesa earlier today - which has killed 10 people, including seven policemen, and injured 47 others.

Ukraine's air force says a strike on Odesa was the result of a ballistic missile being shot down by air defence systems.

The photos shows debris and damaged vehicles in a roadway. People can be seen in the street inspecting damage to nearby buildings and cars.

Image source, State Emergency Service of Ukraine

Image source, State Emergency Service of Ukraine

Image source, State Emergency Service of Ukraine

The number of people injured after the Russian strike on Odesa earlier today has reached 47, Oleh Kiper, the regional head, says on Telegram.

"The struggle for the lives and health of the victims continues in hospitals," he writes. A day of mourning has been declared tomorrow in honour of the ten people that were killed, Kiper adds.

Jessica Parker
Reporting from Florida

President Zelensky had a meeting with Joe Biden in September, pitching his “Victory Plan”.

A key part of that was a plea to use US-supplied missiles on military targets inside Russia. But the pitch seemed to fall flat – until now.

White House officials are emphasizing to US media that the change of heart is in response to Russia’s deployment of North Korean troops; a signal to Pyongyang not to send any more.

But the over-arching political situation in the US cannot be ignored. Joe Biden has just a couple of months left in office and President-elect Donald Trump has signalled his intention to quickly end the war, without explaining how.

But if that means pressing Kyiv to enter into talks with Moscow, the outgoing administration may also want to strengthen Ukraine’s hand – militarily and diplomatically – ahead of any negotiations.