“The US has made every effort.

It is disappointing that the Russian Federation has backed off from an agreement that covered all nuclear warheads for the first time, ”Billingsley wrote on Twitter.

He stressed that this could be a historic deal that is a boon for the United States, Russia and the world.

Earlier, Billingsley announced his readiness to extend the treaty on the limitation of strategic offensive arms (START III) with Russia, subject to a temporary freeze of the size of the nuclear arsenals of the two countries.

Russian President Vladimir Putin proposed to extend the current agreement for at least a year without any conditions.