[bigyabai]

That goal has long since expired. The specific moment it died was the conclusion of the Reykjavík Summit, where Reagan professed that the US would rather invest in Ballistic Missile Defense than agree to strategic arms reduction with the USSR: https://en.wikipedia.org/wiki/Reykjav%C3%ADk_Summit

After that point, collapse was inevitable and no amount of negotiation could prevent the Balkanization of Russia's nuclear-armed states. The US made attempts to stop terrorists from acquiring the unattended nuclear materials, but with sovereign nations they could only ever negotiate them out of a nuke (eg. Taiwan and Ukraine's cases).

In fact, I think the parent comment is making a more prescient comment than you realize. Israel's "strategic ambiguity" over nuclear weapons is ultimately harmful to their view of nonproliferation. It creates an incentive for other countries to follow their perverse lead, which entirely sabotages the goal of documenting and eliminating nuclear weapons.