The UN wasn't designed to hold nuclear powers accountable to non-nuclear powers.
The UN only exists to prevent nuclear war and limit the scale and scope of wars that do breakout.
Anything else it does outside that scope, has to take those operational constraints into account.
That doesn't mean a nuclear power won't get the occasional tisk tisk, but that's mainly an attempt to vent the built up any anger and frustration.
The point is anyone hoping that any institution related to the UN will take radical or significant actions against a nuclear power, shouldn't hold their breath.
They each put a quarter share of $1,000, per the article: