Trump's comments last month sparked fears of a new nuclear arms race and concerns major powers would restart full testing.

Germany and the United Kingdom have warned of the growing threat posed by Russian and Chinese space satellites, which have been regularly spotted spying on satellites used by Western powers.

Russia urged the United States on Friday to clarify what it called contradictory signals about a resumption of nuclear testing, saying such a step would trigger responses from Russia and other countries.

Restrictions on publishers and sellers are more severe. Volumes are being pulled from shelves or redacted, yet bookstores remain important sources of community.

The Russian Defense Ministry said Wednesday that Ukrainian troops should surrender to save themselves in Pokrovsk, a transport and supply hub seen as a gateway to bigger nearby cities.

Russia said on Saturday that its forces continued to advance in grinding battles around the key towns of Pokrovsk and Kupiansk, and had captured a tiny village in eastern Ukraine.

The Justice Department has embarked on a fresh investigation into one of President Donald Trump’s chief grievances, issuing a flurry of subpoenas related to the U.S. government’s inquiry into Russian interference in the 2016 presidential election.

In all, 25 locations across Ukraine, including the capital city Kyiv, were hit, leaving many areas without electricity and heating. Prime Minister Yulia Svyrydenko said on Telegram that major energy facilities were damaged in the Poltava, Kharkiv and Kyiv regions, and work was under way to restore power.

The Kremlin is focusing its fire on Pokrovsk, a gateway to the Donetsk region, which Russia’s president, Vladimir V. Putin, has long coveted.

US president grants relief to fellow rightwing populist after moving to punish Russia over lack of peace deal with Ukraine

China's yuan-denominated exports to Russia dropped in October at the steepest rate in eight months, government data showed on Friday, as a slow down in demand and disruptions from Western sanctions weighed on bilateral trade.