President Trump has announced plans to begin testing nuclear weapons, raising fears of a new arms race as Russia and China respond with warnings.

US President Donald Trump’s decision to resume testing of the country’s nuclear weapons has led to the US Congress being divided, with Democrats calling it a dangerous and misguided retaliation.

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

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.

But President Donald Trump ’s back-to-back announcements about nuclear testing and nuclear submarines on Oct. 29 during his trip to South Korea could turn the nuclear weapons world upside down.

U.S. President Donald Trump shrugged off Russia's test of its nuclear-capable Burevestnik missile, which the Kremlin said had flown for more than 8,000 miles, and said Russian President Vladimir Putin should be focused on ending his war in Ukraine instead.