The members of the Permanent Security Council have agreed to not use Nuclear Weapons as there is no advantage from using them.
One hopes that the other four countries that have nuclear weapons also do not use them.
See Guardian article
Five of the world’s most powerful nations have agreed that “a nuclear war cannot be won and must never be fought” in a rare joint pledge to reduce the risk of such a conflict ever starting.
The pledge was signed by the US, Russia, China, the UK and France, the five nuclear weapons states recognised by the 1968 Nuclear Non-Proliferation Treaty (NPT) who are also the five permanent members of the UN security council. They are known as the P5 or the N5.
Such a common statement on a major issue of global security has become a rarity at a time of increasing friction between Russia, China and the west. With Moscow threatening to invade Ukraine and China signaling its readiness to use military force against Taiwan, the joint statement represents a renewed commitment to prevent any confrontation turning into a nuclear catastrophe.