Russia's point man for arms control cautioned Donald Trump's incoming administration on Friday against resuming nuclear testing, saying Moscow would keep its own options open amid what he said was Washington's "extremely hostile" stance.

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

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.

The Russian government has been a historic opponent of bitcoin, banning its use for domestic payments, but has recently come to see the potential benefits of virtual currencies for evading U.S. and Western sanctions.

Russian companies are using bitcoin to evade Western sanctions, thanks to a new law, the country's Finance Minister Anton Siluanov confirmed in a television interview. Why it matters: Russia's economy has been hampered by difficulties in making and receiving international payments,