Kim Jong-un led two days of military drills “simulating a nuclear counter-attack” on South Korea, according to North Korea’s state-run news agency KCNA. The weekend exercises included the firing of a ballistic missile carrying a mock nuclear warhead.

North Korea must be ready to launch nuclear counter strikes at any time to deter war, state media quoted leader Kim Jong Un as saying on Monday, as he accused the United States and South Korea of expanding joint military drills near the country's doorstep.

Kim Ju Ae has appeared alongside her father at several military events in recent months, catching the attention of North Korea watchers.

Little is known about Kim Ju Ae, but recent appearances with dad Kim Jong Un fueled questions about whether she may be the next to lead North Korea.

North Korean leader Kim Jong Un, accompanied by his daughter, personally oversaw the recent test-firing of the country's most powerful intercontinental ballistic missile, state media images showed Friday.

North Korea’s Kim Jong Un has at least two more children, South Korean officials confirmed on Tuesday, just months after the supreme leader revealed his daughter to the world.

STORY: Kim Jong Un has called North Korea to stand ready to conduct nuclear attacks at any time to deter war.In Monday comments carried by state media, he accused the U.S. and its ally South Korea of expanding joint military drills involving American nuclear assets.