BRUSSELS (AP) — The United States warned Russia Tuesday it has 60 days to start complying with a landmark missile treaty or Washington could abandon the pact, creating doubts about nuclear security in Europe.

At NATO talks in Brussels, Secretary of State Mike Pompeo accused Russia of "cheating at its arms control obligations" under the Intermediate-Range Nuclear Forces Treaty. Pompeo warned that if Russia did not comply with the treaty's terms within 60 days, Washington could activate a six-month notice period for leaving the 1987 pact.

"Russia must return to full and verifiable compliance; Ru...