U.S. President Joe Biden will meet with leaders of South Korea and Japan Friday to come up with a “coordinated” response to the deployment of thousands of North Korean troops to help Moscow’s war against Ukraine and on Pyongyang’s nuclear threat more broadly, on the sidelines of the Asia-Pacific Economic Cooperation Forum in Lima, Peru. Pyongyang’s troop deployment is a “significant development,” White House national security adviser Jake Sullivan told reporters aboard Air Force One en route to Lima, Wednesday. “We are going to treat it with the seriousness with which it deserves to be treated,” he said. Sullivan said