I don't know where you are getting your intel from, but it's not accurate.
I don't know your Russia stance.
If you really think the US Military is ready for a near peer conflict, then good on your motivation, I think that is extraordinarily unlikely, we couldn't deal effectively with with a couple of insurgencies despite the resources thrown into that fight, we literally lost thousands of lives in the GWOT unnecessarily due to incompetence. Do I think we will win against China in a fight? Yes, but it will cost a LOT of lives, a lot of which could be avoided if we did the right thing, which we won't because pronouns are more of a priority, and generals are mot much more than political hacks.
Yes there are some serious problems in the UKR military, and I have railed against them, are they peers to a NATO country? No, but they have shown the bottle to do something no NATO country has done since the 50s, so until NATO does that again, it's like a fat kid in his mom's basement telling everyone how he would be like totally kicking heads in. Ukraine had fuck all support when it stopped the Russian invasion, that was all them. Do they need western help to repel the Soviets from their borders? Yes, but Russia could never have won this without a total unrestricted war, which probably would have drawn Poland in at a minimum, so highly unlikely.
What are your thoughts on foreign fighters?
UKR military is definitely lacking but they are learning and incorporating those lessons far faster than we would.
The 82nd/batt/SOF wouldn't achieve much without the massive back up of the entire US military apparatus, put a battalion of them under sustained accurate artillery fire without that backup and you'd get the same result, do you even know one US military member who has been under sustained artillery fire? It's a very different thing to a firefight or kicking doors. GWOT was a playground.
