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.

President Joe Biden has authorized Ukraine to use powerful long-range American weapons inside Russia, according to a senior US official familiar with the decision, as North Korean troops deploy in support of Moscow’s effort.