It would be much better for Ukraine to lose war than have NATO involved, for reasons described clearly earlier by experts: modern warfare requires the destruction of enemy's military infrastructure on their territory and the conventional warheads on the radar are indistinguishable from nuclear ones. The moment NATO starts bombing military targets in Russia is the end of our civilization (yes, we have had Russian heroes in the past who already saved our planet, but we can only pray their replacements will be equally reasonable - and even that wouldn't probably work once they realize their country is actually under attack).