A country has a leader. This person makes big decisions. Sometimes, the leader uses power in a bad way. This can cause problems for people and other countries.
There should be rules for the leader. Rules help keep things safe. If there are no rules, the leader can do anything. This is not good for the world.
An old story talks about a problem. A leader used military force in another country. People thought this was wrong. It showed a big danger to peace.
We need good rules for our leaders. It helps protect everyone in the world. Strong rules make everyone safer and help prevent big problems.