As ties with US under Trump reach lowest point since Cold War and amid major unresolved issues, Moscow officials say they don't anticipate improvement

Mayor of Japanese city bombed by US at end of World War II raises concern that nuclear states have retreated from disarmament efforts

US announced Monday it had tested a ground-launched nuclear-capable cruise missile previously banned under 1987 treaty with Soviets that expired earlier this month

Analysts say nuclear-powered cruise missile project believed tied to deadly blast at test site features many technical difficulties, and risks could outweigh gains

Russian president warns of 'dangerous consequences' and 'chaos' that could ensue if powers don't engage in 'serious dialogue'

Washington accuses Moscow of 'sustained and repeated' violations of nuclear treaty after withdrawing from agreement