I take the disarmament claims with some degree of skepticism. Alot of these weapons provide substantial flexibility and destructive capability, which superpowers are generally not fond of relinquishing. A lot of the nuclear disarmament stuff hit its peak in the years following the collapse of the USSR, at which point US and Russian relations looked very positive and optimistic moving forward. We're now back to lows not seen since the Cold War.
In any case, for the specifics - Wiki gives 2004 [1] as the date the US reportedly dismantled its nuclear artillery, and in 2000 Russia reported that "nearly all" of its nuclear artillery had been dismantled. Nuclear landmines [2] fall under 'atomic demolition munitions' which are basically any sort of small/mobile nuke, so you get everything from landmines to the suitcase nuke weirdness.
In any case, for the specifics - Wiki gives 2004 [1] as the date the US reportedly dismantled its nuclear artillery, and in 2000 Russia reported that "nearly all" of its nuclear artillery had been dismantled. Nuclear landmines [2] fall under 'atomic demolition munitions' which are basically any sort of small/mobile nuke, so you get everything from landmines to the suitcase nuke weirdness.
[1] - https://en.wikipedia.org/wiki/Nuclear_artillery
[2] - https://en.wikipedia.org/wiki/Atomic_demolition_munition