MANAUS, Brazil — President Joe Biden has authorized Ukraine to use U.S.-supplied long-range missiles to strike deeper inside Russia, easing limitations on the weapons as Russia deploys thousands of North Korean troops to reinforce its war, according to a U.S. official and three other people familiar with the matter.
The addition of North Korean troops was central to the talks, which took place on the sidelines of the Asia-Pacific Economic Cooperation summit in Peru.
The introduction of North Korean troops to the conflict comes as Moscow has seen a favorable shift in momentum.
As many as 12,000 North Korean troops have been sent to Russia, according to U.S., South Korean and Ukrainian assessments.
The White House agreed in May to allow Ukraine to use U.S.-provided weaponry for limited strikes just across the border with Russia.

Biden Authorizes Ukraine to Use U.S.-Supplied Long-Range Missiles Against Russia