The U.S. is accusing Russia of violating the New Strategic Arms Reduction Treaty — or New START — the only remaining nuclear arms control treaty between the two countries. The State Department said Tuesday Moscow was refusing to allow inspections on its territory. Russia said it was complying with most terms of the treaty but that it could not allow U.S. inspections at its strategic facilities given the nations are on opposing sides of the ongoing Ukraine war. Antiwar activists have warned the threat of nuclear war is at its highest point in history due to the Russian invasion.