Trump's Ukraine policy shifts from strong support to softer stance in recent weeks, reversing tough UN summit rhetoric as Russia war continues.

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.

They know we have a nuclear submarine, the greatest in the world, right off their shore,” President Trump said.

Trump warns Putin that U.S. nuclear submarine is stationed right off Russian shores in response to Moscow's new 8,000-mile range missile test on Sunday.

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

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.

Russia boasted about the testing of an "invincible" nuclear-powered missile. Trump said Moscow should focus on ending the war instead.

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.