Yep exactly, the only way to insure deterrence now that the us directly intervened is a nuke.
That's the one lesson, if anything, you learn from Ukraine.
Ukraine gave up the nukes. Got invaded.
Libya agreed to stop developing the nukes. Got invaded.
Iraq, Afghanistan, Iran, Syria etc etc accused of having nukes. Got attacked/rekt.
DPRK developed nukes successfully. Not invaded.
India and Pakistan spat didn't turn into a full war because both have nukes.
Russia allowed to do whatever it wants because it has nukes.
Israel allowed to do whatever it wants because it has nukes.
USA allowed to do whatever it wants because it has nukes.
EU countries allowed to do whatever they want because they have nukes.
The argument for non-proliferation is non existent.