USA annexes Hawaii, no one bats an eye. Russia annexes Crimea, everyone loses their minds.
Yes, the U.S used its imperialist power to annex Hawai'i in 1897. That was before most of the modern foundations of international law - in particular article 2(4) of Chapter 1 of the United Nations Articles[0] - were put in place. No excuse, but still - different times.
There are many aspects of U.S. foreign policy I positively abhor. But I'm not alone; the coups and the assassinations and the fiscal bullying and the straight out illegal wars waged against foreign nations have put quite a dent into the U.S.' lady-liberty image.
Despite all that, the U.S. - at least since the end of WW2nd - hasn't seriously meddled in territorial growth or annexations. That's Russia's game and - given the assurances given to Ukraine after the collapse of the SU - especially perfidious.
All in all, I'm quite happy not to live in the Russian sphere of influence.
[0] https://en.wikipedia.org/wiki/Chapter_I_of_the_United_Nation...