North Korea could send up to 100,000 troops to aid Moscow in its war against Ukraine, Ukrainian President Volodymyr Zelensky warned, amid reports that the North was sending additional long-range artillery systems.

The United States said on Monday it was Russia that is escalating the conflict in Ukraine by deploying North Korean troops, after the Kremlin warned that Washington would deepen its involvement in the war by allowing Kyiv's forces to strike far into Russia with U.

Fox News chief national security correspondent Jennifer Griffin provides details on President Biden's decision to authorize Ukraine to use U.S. missiles against Russia.

A decree signed by the Russian leader, though long planned, came days after President Biden authorized the use of U.S.-supplied missiles by Ukraine for strikes inside Russia.

Russian President Vladimir Putin conducts an exercise of Russia's strategic nuclear deterrence forces to train actions of officials on operating nuclear weapons with practical launches of ballistic and cruise missiles,

The US sees no reason to adjust its nuclear posture in response to Russia’s decision to lower the threshold for using atomic weapons, a National Security Council spokesperson said.

Ukraine’s ATACMS strike in Russia’s Bryansk region marks an intensification of the war amid uncertainty over Donald Trump’s return to the White House.