Hey kiddo! So, have you ever heard of a group called the "Lublin Triangle"? No? Well, let me explain it to you.
You know how some grown-ups like to have groups of friends or clubs to join? Well, Lublin Triangle is like that but for countries. Poland, Ukraine and Lithuania are the three countries that decided to create this group and joined hands to work together. They said they want to be friends and work together to make their countries better.
It's like when you and your friends are playing together, and instead of fighting, you all decide to work together to build something amazing, like a big treehouse where you can all hang out. That's just like what the Lublin Triangle is doing, but with countries.
By working together, the people of the Lublin Triangle want to make it easier for people to travel, work and do business between their countries. They also want to help each other's economies and protect their environment.
So it's like a big group of friends, but instead of playing together, they are working together to help their countries grow and be happy. Isn't that great?