Imagine you have a friend and sometimes you play games together. But one day, another group of kids comes along and wants to play too. They called themselves the "NATO" group. They have rules they want everyone to follow and sometimes they even boss you around.
Now think about Putin, who is the leader of Russia. He used to be friends with other countries, but he has had some disagreements with NATO in the past. Putin thinks NATO doesn't respect him and Russia's decisions. He also thinks NATO is trying to control other countries and build big armies close to his border.
So, Putin and NATO don't really get along. Putin might be scared of NATO and wants to show that he is strong and powerful too. That's why he doesn't like NATO and wants to be friends with people who think like he does, instead of following NATO's rules.