“Demilitarization would need to be limited to types of weapons and depend on location. The Russians should clarify what they expect.”
The problem is what credibility does Russia have? If Ukraine disarms what is to stop Putin trying to invade for a third time?
They had a neutrality agreement signed in 1994 for Ukraine to give up its nukes. Russia violated it.
Ukraine needs to either be in NATO, or it needs to be a Taiwan/Israel style fortress state.
If Ukraine accepts those terms, Russia will roll through the entire rest of the country within a year.