> NATO is currently not, however, engaged in any effort of nuclear arms reduction.
START I, SORT, and New START (which is currently ongoing) don't count? And INF, though that was shelved due to Russian breaches (Kaliningrad cough), but even without that it wouldn't have had much more of a future due to it being bilateral, with no Chinese involvement.
> I have to say, I consider MAD theory to be completely misguided, and also morally wrong to engage in nuclear retaliatory attack.
MAD is irrelevant for this question. It's about stable vs unstable conditions. When everyone in the room has a gun, there is balance. If everyone in the room provably has no gun, there is also a balance. The former balance is vastly more stable than the latter, because even a fractional gun in the latter scenario changes the picture dramatically, while doing approximately nothing in the latter. Consequently, the value of an individual gun goes up hugely as the total number of guns in the rooms approaches zero. Russia having one more nuke today? Buys them virtually nothing. Someone finding a nuke in the basement in the utopian nuke-free world? They own the world.
It's an inherently unstable setup. Nukes will never go away and trying to do so is the most dangerous thing anyone could try to do. It's perhaps the least probable example of trying to put the genie back in the bottle. The best we can do is multilateral reduction in lock-step and preventing proliferation to more states.
> (they are rather doing the opposite, expanding)
Elaborate