Don’t underestimate the power of little things to change relations between states, I’m not saying this movie will cause some sort of international incident, it probably won’t, but given the somewhat paranoid state of official Russian policy making these days it’s not inconceivable that it could have a political effect.
The Latvians recently moved one memorial tablet to the Red Army to a different area of their capital city (remember for the Latvians the Red Army was a invading army of conquest and occupation) and this almost sent the Russians into a state of apoplexy.
i agree that “little” things can change relations between states. but i guess most of this depends on when this things happen (and of course the general status of the relation between this countries.) i don´t think that germans citizens who watch this movie will blame current russian regime for this because it happend in 1945. they may blame russia for other things that happened in the recent past. btw you should not forget that germany and austria allways blames people who actually critizise “us” for events that happened in this past (because “we” tend to get angry about this). so i don´t think that germans are willing to blame russians for events in 1945.