The United States delivered Russia a 60-day ultimatum on Tuesday to come clean about what Washington says is a violation of a arms control treaty that keeps missiles out of Europe, saying only Moscow could save the pact.

NATO allies led by Germany pressed U.S. Secretary of State Mike Pompeo at a meeting in Brussels to give diplomacy a final push before Washington pulls out of the 1987 Intermediate-range Nuclear Forces Treaty, fearing a new arms race in Europe.

Russia denies undertaking any such development of land-based, intermediate-range Cruise missile capable of carrying nuclear warheads and hitting European cities at short notice.