Maybe the word “directly” didn’t translate well. If Russia engages NATO directly, their forces will be wiped off the map. Ukraine is using old NATO equipment from the 90s that was pulled out of storage and kicking all kinds of Russian ass. Direct NATO involvement would mean carrier groups, F35s, stealth bombers, and a whole lot of other fun things the Russians have zero answer for.
Ukraine needs to be allowed to go weapons free in Russia proper, destroy their air defenses, then start hitting refineries and other high value targets throughout Russia and especially near Moscow. Then, peace talks can be productive.