Nato: Sweden and Finland have asked to join but what does that mean?

Sweden and Finland have asked to join the alliance of countries called Nato.

It would be an important step that would change their relationship with the world but it's a step that Russia doesn't like.

Nato was formed in 1949 with its main goal to prevent war and look after its members if they were to be attacked by another country.

Here's why it's happening and what you need to know.