I think nuclear deterant is the only thing that has a chance of working for countries that aren’t military super powers, and even military super powers have them for a reason. And a country having to rely on benevolence of other countries leaves too many things to chance for nations that wish to be sovereign.
Yeah, countries will prioritize self preservation and will gladly let even their allies get destroyed to survive. Can’t trust anyone but themselves. Everyone else is just posturing when it is convenient for them.