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.

One of Vladimir Putin’s ministers warned Donald Trump that Russia would not be “ruling anything out” when it came to nuclear testing once the president-elect is in office. Post-Soviet Russia has not tested their nuclear weapons since 1990 while the US last tested in 1992.

Russia can definitely work with the administration of Donald Trump after he is sworn in as U.S. president next month, Deputy Foreign Minister Sergei Ryabkov said on Wednesday. Ryabkov reiterated accusations by Moscow that "reckless" actions by the West had raised the risk of nuclear war and described the global security as depressing.

Russia, with 5,580 warheads, and the United States, with 5,044, are by far the world's biggest nuclear powers, holding about 88% of the world's nuclear weapons, according to the Federation of American Scientists. China has about 500 warheads.

Russia warns of potential nuclear testing in response to Trump's stance, raising concerns about global security.

Is the world nearing a nuclear showdown? Russia has issued a dire warning to the U.S., raising concerns about the future of the Comprehensive Nuclear Test Ban Treaty. Russian Deputy Foreign Minister Sergei Ryabkov has called U.