North Korea has declared its "toughest" counteraction strategy toward the United States during a key party meeting, asserting that the military cooperation among South Korea, the U.S. and Japan has expanded into an aggressive nuclear military

During a five-day plenary meeting of the ruling Workers’ Party, Kim called the U.S. “the most reactionary state that regards anti-communism as its invariable state policy.”

North Korean leader Kim Jong Un held a key policy-setting meeting of the country's ruling party last week ahead of the new year, state media KCNA reported on Sunday.