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

Questions have arisen after Russian President Vladimir Putin said his country tested two nuclear-capable weapons this week.

Senate Democrats push back against Trump's nuclear testing plans with new legislation requiring congressional approval for ...

Putin orders nuclear test preparations after Trump announces U.S. will resume testing. Russia vows proportionate response to ...

Russia urged the United States on Friday to clarify what it called contradictory signals about a resumption of nuclear ...

Russian Foreign Minister Sergei Lavrov said on Saturday that work is under way on President Vladimir Putin's order to prepare ...

The comments follow Russian defense minister Andrey Belousov announcing that Moscow should “immediately” prepare for ...

Dmitri S. Peskov, a Kremlin spokesman, told Russian news agencies that recent drone and missile tests were not nuclear ...

After Trump's comments, Putin ordered his top officials to provide proposals on how to restart Russia's live nuclear weapons ...

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

President Trump wants to restart domestic testing to keep up with adversaries like China and Russia, but nuclear experts ...

The announcement via social media post came after Russia recently said it conducted multiple nuclear weapons tests.