No more then Berlin was American, french, British or Russian.
Invading a place does not make it yours. Running a place does not make it yours. Having the majority of the citizens be you, that makes it yours.
“Invading a place does not make it yours. Running a place does not make it yours. Having the majority of the citizens be you, that makes it yours.”
No, Ruzzia does not have any rightful claim to any part of any other country just because their citizens infest those countries.