By David Brunnstrom, Idrees Ali and Ju-min Park WASHINGTON/SEOUL (Reuters) -When South Korean President Lee Jae Myung meets U.S. President Donald Trump next week for their first summit, he will be asked to pay more for the upkeep of American troops on the peninsula during talks set to be dominated by security issues and China.

North Korea ruled out a role for South Korea in any regional diplomatic talks related to Pyongyang and warned of “countermeasures” against “the most hostile state” as it criticized the ongoing military cooperation between Seoul and Washington.