[en] A workable form of the longitudinal dielectric functions for classical TCP consisting of electrons and ions having charge Z is found on the basis of BBGKY approach in the first approximation in plasma parameter g = 3/4 π r³sub(d)n, rsub(d) = (T/4 π n e²)sup(1/2, n, T being plasma electron density and temperature. Calculation of collective losses of ions in such plasmas performed with these dielectric functions show that the losses can be influenced essentially by the correlational effects. The correlational effects can influence essentially stopping power of nonideal ablator-pusher plasmas containing high-Z ions, especially at the preheat stage. The same is true for plasmas arising as result of metal foil irradiation by intensive ion beams. (author)