Come again? The Russian of German decent go back to the days of the Czar...

Kalingrad [1] used to be part of Prussia.

[1] https://en.wikipedia.org/wiki/Kaliningrad

Ah, so pre-WW2 then... And for the most time part of the German Empire / Prussia. A nationish state that doesn't exist anymore for more than 100 years. And then it was conquered by the USSR during WW2, which was started by whom again?

Anyway, what does this have to do with Russias invasion of Ukraine again?

Yes but I think the German population was almost entirely driven out.