“The Secretary-General stresses that at a time when global anxieties about nuclear weapons are higher than at any time since the Cold War, efforts in nuclear disarmament, non-proliferation and arms control are more vital than ever,” said a statement issued by his Spokesman Stéphane Dujarric.

“These endeavors can play significant roles in building trust and confidence, and preventing, mitigating and resolving conflicts,” the statement added.

Known as “New START,” the Treaty on Measures for the Further Reduction and Limitation of Strategic Offensive Arms reduces deployed nuclear weapons to 700 delivery vehicles and 1,550 warheads.

It is a part of a series of bilateral nuclear arms control agreements between the two nations that “have significantly reduced the dangers posed by nuclear weapons and are steps towards the common aspiration of a world free of nuclear weapons,” the statement noted.

Guterres called on them “to engage in the necessary dialogue that will lead to further arsenal reductions” and “to continue to display the historic leadership across the multilateral disarmament agenda that has proven so valuable to our collective security,” the statement said.

The new Treaty was signed in Prague on 8 April, 2010 and came into force on 5 February, 2011.