Russia annexed the Crimea in about 1783
And on 19 February 1954, Mr. K gave it back to Ukraine.
Which, at the time, was no big deal, because Ukraine was merely a province of the USSR. Like, Is Long Island part of Connecticut or part of New York?
This argument smacks of arguing over whether Gitmo is part of Cuber or not. Clearly, Russia should have no voice in that question!