US warns Russia it is ready to abandon key nuclear pact

U.S. Secretary of State Mike Pompeo, right, speaks with NATO Secretary General Jens Stoltenberg during a group photo of NATO foreign ministers at NATO headquarters in Brussels, Tuesday, Dec. 4, 2018. (AP Photo/Francisco Seco)
Ukraine's Foreign Minister Pavlo Klimkin speaks during a media conference after a meeting of NATO foreign ministers at NATO headquarters in Brussels, Tuesday, Dec. 4, 2018. Russia takes center-stage at NATO Tuesday, as allied foreign ministers meet to debate ways to dissuade Moscow from destabilizing Ukraine and respect a landmark Cold-war era nuclear treaty. (AP Photo/Francisco Seco)
U.S. Secretary of State Mike Pompeo, center, and NATO Secretary General Jens Stoltenberg, right, arrive for a round table meeting of the North Atlantic Council with Georgia and Ukraine at NATO headquarters in Brussels, Tuesday, Dec. 4, 2018. (AP Photo/Francisco Seco)

BRUSSELS — The United States warned Russia Tuesday it has 60 days to start complying with a landmark nuclear missile treaty or Washington will abandon the pact, raising concern about Europe’s future security.