Okay kiddo, so there are these two big countries called Ukraine and Russia. They used to be part of the same country a long time ago, but then they separated into two different countries.
Now, some people from Ukraine go to live in Russia for different reasons. Some go to work, some go to study, and some go to visit family or friends who live there.
But sometimes, there can be problems between Ukraine and Russia because they don't always agree on things, and this can make it harder for Ukrainians in Russia. Sometimes, Ukrainians in Russia might feel like they are treated different, or not as nicely, because they are from Ukraine.
It's important to remember that even though they might be from different countries and have different beliefs or customs, everyone should be treated with kindness and respect, no matter where they come from.