Lyons questioned the timing of the decision, saying, “I’m not sure why we didn’t allow this two or three years ago."

With two months left in office, the president for the first time authorized the Ukrainian military to use the system known as ATACMS to help defend its forces in the Kursk region of Russia.

President Joe Biden authorized Ukraine to use U.S.-supplied long-range missiles inside Russia for the first time Sunday, according to multiple reports—an escalation of U.S. involvement in the conflict in response to North Korean troops being sent to aid Russia.

Ukraine used U.S. ATACMS missiles to strike Russian territory for the first time on Tuesday, Moscow said, in an attack regarded by Russia as a major escalation on the war's 1,000th day. Russia said its forces shot down five of six missiles fired at a military facility in the Bryansk region,

President Vladimir Putin has signed a revised nuclear doctrine declaring that a conventional attack on Russia by any nation that is supported by a nuclear power will be considered a joint attack.

Joe Biden’s decision to let Ukraine hit targets inside Russia failed to galvanize broader allied support for Kyiv, in a sign of the outgoing president’s waning influence.

President Joe Biden for the first time authorized Ukraine to use U.S.-given long-range missiles to strike inside Russia, a prospect that Trump allies believe could threaten "World War III."