We Poles murdered Ukrainians and they murdered Poles, because we were stupid and couldn't live on the common land.==
Did you read Hemric Senkevich novel "By flame and sword"?
Ukranians joined Russian voluntarily. Now they voluntarily exited.
Anyway they won't agree with you that those "common land" which you call Estern Poland is polish.
Now we are wiser and do not allow Moscow to rule our both countries.===
Moscow don't want it either. It was russians who disbanded USSR.
Today situation when everyone pays good money to Russia for oil and gas is very convinient for her.