Okay, let's try to explain corruption in Ukraine as if you were 5 years old.
Have you ever played a game with your friends where someone cheats to win? That's kind of like what corruption is. It's when someone who is in charge or has power decides to do bad things to help themselves instead of doing what's fair and right.
In Ukraine, there are people who are supposed to be in charge of making sure everyone is treated fairly and the rules are followed. But sometimes they don't do their jobs properly. Instead, they might take money or give special treatment to their friends or family members. This is called corruption.
This can be really bad for the people of Ukraine because it means they might not get the help or resources they need. It also means that some people might get away with doing bad things because they have connections or money to bribe people.
So, the government is working on trying to stop corruption by making new laws and punishing people who do it. But it's a big problem and it will take a lot of work to make things better.
But the good news is that Ukraine has a lot of people who want things to change and they are working hard to make their country a better place.