“We are doing everything to stop the war,” he wrote on X on Tuesday, adding that he had two dozen meetings scheduled. The meeting, he said, underlined “the global nature of the changes brought about by this war, the war that Russia began in Crimea”. The Ukrainian military has denied the claims, saying that Moscow’s troops had made less progress in the region than they had reported. Ukraine’s military says it is engaged in counterattack operations in part of Donetsk region, the focal point of the conflict. Putin said allowing the New START agreement signed in 2010 to expire would be destabilising and could fuel proliferation of nuclear weapons.