An answer to that question must be framed in perspective of when in history.
Once territory is acquired by the Russian or Soviet empire, it was conquered. In the case of the US, it seldom was.
Motives are different. I am not defending our non-declared wars. In my opinion they have all been illegal and almost never in the interest of the US.
But to compare Russia to the US, that is FAR OUT.
My point is America has done bad things, too. And we’re supposed to be the good guys.