Ukraine plans to conduct its first long-range attacks in the coming days, the sources said, without revealing details due to operational security concerns.
Russia has warned that it would see a move to loosen the limits on Ukraine's use of U.S. weapons as a major escalation.
Some congressional Republicans had urged Biden to loosen the rules on how Ukraine can use U.S.-provided weapons.
Russia is advancing at its fastest rate since 2022 despite taking heavy losses, and Ukraine said it had clashed with some of those North Korean troops deployed to Kursk.
Despite Zelenskiy's pleas, the White House had been reluctant to allow U.S.-supplied weapons to be used to strike targets deep inside Russia for fear this could escalate the conflict.
Persons:
Joe Biden, Volodymyr Zelenskyy, Joe Biden's, Donald Trump, Trump, Richard Grenell, Grenell, Biden, Zelenskiy, Alex Plitsas, Radoslaw Sikorski, Putin, Sikorski
Organizations:
U.S, State Department, Trump, Biden, Korean, Atlantic Council, Bradley Fighting Vehicles, Abrams Tanks, White
Locations:
Ukraine, Kyiv, Russia, Korean, Washington, Ukrainian, U.S, Kursk, HIMARS