NATO is already involved. UK, US, and many EU nations are actively involved in killing Russians: weapons, intelligence, satellites, cash, sanctions, mercenaries, etc. Russia is killing Ukrainians and a few NATO officers stationed in Ukraine. Russia is not killing anyone in the USA, UK etc. Yet.
YET...at least publicly. There have been several "accidental" deaths tied to key positions. It's hard to tell who is calling the orders, but our regime seems to be working on behalf of Russia...so there is that.
US/Israel/NATO is running out of bombs. There are limits. The Trump regime would rather destroy Taiwan than Ukraine. Trump can't continue killing children in Gaza, Yemen, Lebanon, Syria, Iran, etc. Trump/Ukraine did kill some high ranking Russian generals. I don't think that helped Russia.
I don't know what to expect. Gas-lighter-n-Chief Trump claimed "peace" when he launched an illegal war of aggression against Iran. Bombing a nation that didn't bomb the USA. He later had to beg for a cease fire from Iran, so Israel/UK/USA could re-arm after getting their asses handed to them.
What will Bibi and Trump do when there are only nukes left? They are unable to accept other people as their equals...they'd rather end life on earth, I fear.
We should be demanding that Hamas end the devastating war they started.