Hey there kiddo, so let's say you have two groups of friends who don't really get along. Let's call them group A and group B.
Now, one day, some people from group A decide they want to start their own club, with just their own rules and activities. They call it Novorossiya. But group B doesn't like this idea - they think everyone should just be part of the same club and follow the same rules.
So now, there's a disagreement between the two groups, and it's become quite a big problem. People are arguing and fighting about it, and it's not very nice.
In real life, Novorossiya is a complicated situation involving parts of Ukraine and Russia. But just remember that it's like two groups of friends who are having trouble getting along and it's causing problems.