Don't be naive. It's just another tactic to discourage new nations from joining the club.
"See, we don't even want nuclear weapons. We're gonna get rid of them any year now, so there's really no point in you getting nukes, either. Here we are commiting to getting rid of these terrible weapons and if you're trying to get more, you must be a terrible person."
It's a transparent attempt to seize the moral high ground.
The US and Russia could spend decades slowly disarming their nuclear stockpiles and still maintain an arsenal capable of leveling all civilization. Dialing down the armament makes all kinds of sense in terms of reducing costs and recovering potential fuel, but nobody is naive enough to think that the genie of nuclear war can be stuffed back in his bottle.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
