Russia and the United States agreed to resume high-level military contacts, in a major step of rapprochement between the world's top nuclear powers at Ukraine talks in Abu Dhabi on Thursday."The U.S.

Russian oil revenue fell 50% in January compared with the same month the previous year after tough new sanctions imposed by the U.S. Treasury.

MOSCOW, Feb 5 (Reuters) - Russia expelled a German diplomat on Thursday in response to what it said was Berlin's groundless expulsion of a Russian diplomat last month and accused Germany of being in the grip of "spy mania".

A Russian official said Moscow is ready to respond with military measures if the United States deploys its missile defense program to Greenland.

Russian President Vladimir Putin has discussed the burgeoning economic cooperation between Moscow and Beijing and their relations with the United States in a video call with Chinese leader Xi Jinping.

As the talks in Abu Dhabi between Ukraine, the US and Russia continue, Volodymyr Zelenskyy called on the US president to respond to Moscow’s massive aerial attacks and the violation of Russia’s “energy truce” promise.

Russia is ready for the new reality of a world with no U.-Russian nuclear arms control limits after the New START treaty expires this week, ​Moscow's point man for arms control said on Tuesday.

Moscow's latest overnight barrage came amid temperatures as low as -14 F.