President Donald Trump's call for the U.S. to resume nuclear testing after a more than 30-year pause has caught Russia's attention, with the Kremlin warning on Thursday that it would "act accordingly" if a Cold War-era moratorium on nuclear weapons' testing was broken.

President Donald Trump said the US would match its rivals in testing nuclear weapons after Russia in recent days announced trials of a nuclear-powered underwater drone and nuclear-capable cruise missile.

President Trump has ordered the military to “immediately” begin testing nuclear weapons for the first time in more than three decades in response to the growing arsenal Russia and China are amassing, he announced Wednesday.

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

Experts say there are roughly 12,241 nuclear weapons across the world, with just over 9,600 thought to be operational.

President Donald Trump on Thursday vowed to begin testing US nuclear weapons “on an equal basis” with Russia and China, heralding a potentially major shift in decades of US policy at a time of growing tensions between the world’s nuclear-armed superpowers.

Days after canceling a planned summit with Putin, citing a lack of progress toward ending the war in Ukraine, Trump took a major step by effectively blacklisting Rosneft and Lukoil.

President Trump on Saturday said the lack of progress toward peace between Russia and Ukraine amid their more than three-year war is “very disappointing.” The president has attempted to chart a

President Donald Trump on Monday took aim at Russia’s announcement that it has tested a nuclear-powered missile that can go more than 8,000 miles, telling President Vladimir Putin that he “ought to get the war ended” instead.

Bryce McFerran is a senior executive at a steel-trading business co-owned by one of Russia’s richest oligarchs and is married to a member of a Russian family with extensive ties to the Kremlin.