The North Korean leader said the partnership poses a grave threat to his country and vowed to further bolster his nuclear weapons program.

SEOUL (Reuters) -North Korean leader Kim Jong Un criticised trilateral military cooperation among the United States, Japan and South Korea for raising tensions in the region and vowed countermeasures,

North Korean leader Kim Jong Un has said an elevated U.S. security partnership with South Korea and Japan poses a grave threat to his country and vowed to further bolster his nuclear weapons program