Since the Cold War, nuclear non-proliferation has been based entirely on the idea that NATO would balance Russia and vice versa.
Given that NATO as it has been understood is now effectively dead, the non-proliferation treaty is essentially dead too.
Europe needs to rapidly increase it’s nuclear weapons stockpile (and realises this), but this also gives other countries around the world an incentive/excuse to do the same.
Canada has no nuclear umbrella of its own, is not part of a mutual defence alliance beyond NATO, and they are being actively threatened with annexation by a Russia-controlled US. They’ll clearly need to build or agree by pact their own nuclear defence as a matter of national emergency. It’s hard to see how anyone will place much trust in such pacts ever again though.
It’s a scarier world we’re entering, and is significantly more dangerous than even the Cuban missile crisis.