I think the biggest problem with Russia-Ukraine right now is we are horridly confused about what's happening and I hope to god the people in charge are not confused.
Russia is fighting Ukraine with Soviet junk from 1970s and some of it maybe 1980s.
Russia HAS modern equipment it is not utilizing against Ukraine.
Most of this is because it has to be committed against NATO. Kirovs, Zirkons, Boreis, Bulavas, Hypersonics, Standoff Cruise missiles, etc. etc. etc.
These weapons aren't making mincemeat of Ukraine because they were never meant to be used in Ukraine.
The US has made gross mistakes in the past when Russia was weak. Russia is no longer weak. If the US got involved in North Korea, Russia WOULD INVADE NATO as soon as 100,000+ US soldiers landed at Busan.
Why?
Because the US notoriously commits all its forces to "the fight". Once it's committed in South Korea....there'd be nothing left to defend Europe. And that's a problem of underestimating your enemy.
And Russia knows that a bunch of tiktok queers advertising their latest make-up aren't going to die in Nuclear hellfire for anyone anywhere.