I can assure you that we in the US aren't going to commit global suicide over Ukraine.
Remember that we were all set to sign off on using UK/American missiles to hit targets in Russia. Then Putin said he'd view that as an attack by the UK/America and would use nukes. We immediately backtracked and said our policy wouldn't be changing (Biden seemed particularly unhappy about the announcement).
If you know about the whole no-nonsense, "strong leader" mentality in that region, this wouldn't be a mystery. Putin making fake red lines would severely damage him politically. Look at Ukraine. He said he'd invade if they tried joining NATO. We claimed they were and Putin invaded even though it has cost his country a fortune.
It's something else - a new game with different rules. You can decry/condemn it this influence-jockeying all want, but if you can't get past 19th/20th century idioms and imagery about how the world operates, you'll never get anywhere in your analysis.
I guess you're also completely unaware of the shenanigans they pull to avoid giving independence.
I'm not lecturing about anything, and it seems you're jumping to a whole bunch of unwarranted conclusions here.