FILE - U.S. Secretary of Defense Lloyd Austin, left, speaks with Ukraine's President Volodymyr Zelenskyy during the Ukraine Defense Contact Group meeting of NATO defense ministers at NATO headquarters in Brussels, Oct. 11, 2023. Ukraine has used U.S weapons to attack inside Russia in recent days. That's according to a Western official familiar with the matter. The weapons were used under recently approved guidance from President Joe Biden allowing American arms to be used to strike inside Russia for the limited purpose of defending Kharkiv, Ukraine’s second-largest city. (Olivier Matthys, Pool Photo via AP, File)