Jesus: Russia signed a treaty to not invade Ukraine, in exchange for Ukraine's nuclear disarmament. Ukraine disarmed. First nation to do so in the history of nuclear weapons. Then Russia invaded. You want to trust them with another treaty? Suckers!
Well, Russia already has enough test data to just rely just on computer modeling and simulations to develop one. Just like the US. The point is not to impose the treaty on the stronger nations, but the developing and weaker ones. Iran, NK, and the likes. You get to bomb Iran for breaking the treaty (if they signup for it). This is how treaties work, whether you like it or not.
Ukraine made a really bad deal, I agree on that. US was stupid to force/encourage Ukraine to give up its nuclear weapons too. That doesnt mean all treaties are bad ideas and will be broken.