Iran's President Masoud Pezeshkian questioned on Monday the United States' sincerity in seeking negotiations with Tehran while imposing sanctions, a week after President Donald Trump reimposed maximum pressure" on the Islamic Republic.

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

North Korean leader Kim Jong Un has vowed to bolster his nuclear weapons program in response to the U.S.’s enhanced security partnership with South Korea and Japan. Last year, the U.S. expanded bilateral military exercises with South Korean and trilateral training with South Korea and Japan.