Putin can get away with this for now because he has the threat of nukes. The US also had this threat when it invaded the sovereign country of Iraq. As it turned out Saddam pretended to have nukes to back other countries off. Now it does seem a bit hypocritical for the US to be so concerned about sovereignty. I am against any of this aggression by any party. The propaganda on both sides is deep but it seems Russia has taken it to a new high(low?).Would he have invaded anyway if NATO had said it wouldn't ask Ukraine to join? Who knows? Biden didn't put US boots on the ground in Ukraine which would have been a real excuse for Putin. All of the major powers have flawed governments but the Nazi excuse is a bit thin. The US obviously has Nazis but it isn't a Nazi state. It's all a crying shame. Is this the best the human race can do? I'm sick of all the hypocrisy about the reasons for war from all the actors.
How many countries has the US invaded since WWII?
According to Kelly and Laycock's book, the United States has invaded or fought in 84 of the 193 countries recognized by the United Nations and has been militarily involved with 191 of 193 – a staggering 98 percent.
https://www.wearethemighty.com/articles/these-are-the-only-3-countries-america-hasnt-invaded/