There are parts of Ukraine that have belonged to Russia since the 1800’s, but you would know this if you could read. My great grandfather and his family before and after 1850’s were born in what is modern day Ukraine, but they were Russian citizens. Germans who migrated to Russia when invited by Catherine the Great.
What is going on there, is none of the business of the US. Just like it was not our business to attack the Serbs under Clinton.
As did Poland, Finland and the Baltic states. The Russian Empire is over and these people have the right of independence and self-determination.