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.

Ukraine appears at increasing risk of losing the city of Pokrovsk, an important stronghold in eastern Ukraine where it has held off Russia for more than 18 months.

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.

Russian Foreign Minister Sergei Lavrov said on Sunday that he was ready to meet U.S. Secretary of State Marco Rubio but that Russia would not abandon its core conditions for ending the Ukraine war.

Andrey Belousov, Russia's defense minister, made the announcement after President Donald Trump said the US would start nuclear tests.

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.

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

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.

Russia launched a massive overnight missile and artillery assault on Ukraine, striking energy infrastructure that supplies power to the Khmelnytskyi and Rivne nuclear power plants. According to Ukrainian officials,