Give it back to who? I don't think the Poles will be too impressed at being told to give up some of their land.
No,Im being reasonable,give the city and its imediate environs back to the Germans,the place needs a good clean up,the rest of it the countries that actualy border the "oblast" can share it,sorry Russia,no bits for you then.
And lol to Poland not having a history of using terror tactics against occupiers...tell that to the various underground groups in ww2(and just after for that matter),tell it to the dead germans in the various bars and cinemas blown up,or the germans or Polish colaberators shot in the street or their homes.....but wait,the afgans often use kids and fight while positioned amongst local civilians,that could never happen in Poland....Warsaw 44 grey ranks etc etc.
If the chips are down any nationality can get down and nasty if thats whats felt to be needed.