in·vade
verb
1.(of an armed force or its commander) enter (a country or region) so as to subjugate or occupy it.
Are the Russians occupying the Ukraine? In military tactical terms, no.
But if you want to call it an invasion, call it an invasion. My problem was with the World War 2/Nazi analogy.
I love discussions of semantics. “Subjugate or occupy.” Note the word, “or.” Now argue that Russia has not “subjugated” Crimea.