So? In the past Crimea belonged to Russia. Why is this our problem? The US has troops in just about every place in the world fighting for other countries. Time for the nation-building, world policeman crap to stop.
Crimea only went to Ukraine, because Khrushchev, wanting to make nice with the Ukrainians after being Stalin’s man in Ukraine, made the meaningless gesture of transferring Crimea from the Russian SSR to the Ukrainian SSR.
So? In the past Crimea belonged to Russia.
In the past Los Angeles belonged to Mexico.