North Korean leader Kim Jong Un oversaw the test-firing of "cutting-edge" hypersonic missiles to ready Pyongyang's nuclear forces for war, state media said Monday.

North Korea has denounced the U.S. strikes on Venezuela as "the most serious form of encroachment of sovereignty," state news agency KCNA said on Sunday.

Ju Ae has been making increasingly prominent appearances in state media in recent years, fueling speculation that she is being prepared as Kim’s successor.

South Korean President Lee Jae Myung will meet Monday with Chinese counterpart Xi Jinping in Beijing, with closer economic ties as well as the recalcitrant North on the agenda.Lee is the first South Korean leader to visit Beijing in six years and his meeting with Xi on Monday came a day after the nuclear-armed regime in Pyongyang fired two ballistic missiles into the Sea of Japan.