North Korea sent some missiles into the sea. This was on Sunday. It happened before South Korea's President visited Beijing. These launches made people worried. They also made people ask about leader Kim Jong-un's next leader.
The missiles went up near the capital. They flew far, about 900 kilometres. Leader Kim Jong-un watched the tests. This means they want better weapons. Kim Jong-un said the tests were good for defence. North Korea says it needs to be safe.
The tests happened before President Lee Jae Myung met China's leaders. They wanted to talk about North Korea's weapons. The missiles sent a message. North Korea does not want to talk. They also do not follow rules.
Kim Jong-un's daughter was also seen. She was with her parents. Some think she could be the next leader. This and the focus on weapons may mean a new leader is ready.
South Korea and the United States are looking at the tests. They are ready for more. Seoul said the tests broke rules. Japan also said the weapons are a threat. This makes the world less safe.