Russia is not the Russian Empire, or the Soviet Union. By percentage wise Ukraine has gobbled up parts of Romania, parts of Poland and Russia, and from 700 years ago when it didn't even exist, it has grown 1000% or more:
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Ever heard about Kyiv Rus and Muscovy?
If you see no connection between Muscovy around 1300, Moscow, and modern Russia, I have nothing else to say. Up to this day, Russia rules about 15 ethnicities it previously subdued, so apparently not expansionist, not an empire, and doesn't need to give away any more territories to where they belong. They just need another hundred years to completely destroy native languages and culture.