Imagine you have two friends, Iran and the United Kingdom (UK). They used to be really good friends a long time ago, but then they had a big argument and stopped talking to each other.
The argument was about the UK being worried that Iran was developing some really dangerous weapons that could hurt a lot of people. Iran said that it was just trying to protect itself, but the UK didn't believe them.
This made things really tense between Iran and the UK. They started treating each other differently and didn't want to be friends anymore.
However, as time went on, they started to realize that they needed each other. Iran had some things that the UK wanted, like oil, and the UK had things that Iran wanted, like money and technology.
So, they decided to try and be friends again. They started to talk and listen to each other's concerns. They also agreed to some rules so that they wouldn't get into another big argument.
Now, Iran and the UK are still working on their friendship. They may not be best friends yet, but they are being kinder to each other and are willing to work together on things that benefit both of them.