These sound like nice words on paper, but how do you go to war with a nuclear power without triggering Armageddon? It’s a serious question. MAD is absolutely still a thing and nukes are the best protector of sovereignty ever devised.
Well, good game, now give up, they have nukes? ...
Also Ukraine does not ask for military interventions.
Poland offered military intervention, Ukraine refused.
Ukrainians want weapons.
I'm not saying this is what we should do but it's what will happen probably: Freeze Nato accession, send guns, helmets etc. Basically whatever happened to Ukraine.