"Political interests" is a traditionally bad framing for a war in Russia, as opposed to WWII perceived as a "sacred war" (as in that song) for the very survival against a vicious invader (not wrong, considering the Generalplan Ost). For example it is said in the narration the intro to the depressing documentary Damned and Forgotten (Прокляты и забыты) about Russian soldiers in Chechnya and elsewhere in the 1990s, where scenes from WWII in the East are contrasted with slowly emerging scenes from Grozny turning black and white into color: https://youtube.com/watch?v=_m07z9_k4hA

E: it's not said actually in the into (where it's only mentioned for how there came "an era of other wars") but in the mass grave scene later on. Oh, and there are also the NazBols.