China, Russia, Britain, the United States and France have agreed that a further spread of nuclear arms and a nuclear war should be avoided, according to a joint statement by the five nuclear powers published by the Kremlin on Monday.

It said that the five countries - which are the permanent members of the United Nations Security Council - consider it their primary responsibility to avoid war between the nuclear states and to reduce strategic risks, while aiming to work with all countries to create an atmosphere of security...