23 September 2015, 14:02 GMT
WASHINGTON (Sputnik) — The United States and Russia signed the INF Treaty in 1987 to eliminate the threat of nuclear missiles capable of striking targets on the European continent.
"We do continue to cooperate productively with Russia in co-chairing the Global Initiative to Combat Nuclear Terrorism," Countryman said at a Senate Foreign Relations Committee hearing.
The Russian Foreign Ministry expressed concern about upgraded US nuclear deployment plans, saying this would also infringe on the 1970 nuclear non-proliferation treaty, ratified by more than 190 states.
