Russia's point man for arms control cautioned Donald Trump's incoming administration against resuming nuclear testing, saying Moscow would keep its own options open.

Moscow has warned Donald Trump against resuming the testing of nuclear weapons when he takes office, saying it would “not rule anything out” in response to US aggression. Sergei Ryabkov, Russia’s deputy foreign minister who oversees arms control, noted that Mr Trump refused to ratify the Comprehensive Nuclear-Test-Ban Treaty during his first term.

Deputy Foreign Minister of the Russian Federation Sergei Ryabkov said American policy is "extremely hostile" toward Russia.