There are quite a lot of Ukrainian-speaking users on the forum, there is not enough general topic for discussion of issues, it is not active precisely because it is inconvenient to search for information there due to the fact that it is fast flowing. The demand for a separate thread has existed for a long time, and there are enough reasons for its creation.
I don't think it's make sense to say the thread is not active because of fast flowing, what about the Nigerian when they also start with one thread and then @theymos create a local board for them since they're have a good amount of traffic.
I can't read your language and Russian language, but my assumption you guys are more active in Russian board, correct?
That's make @theymos think no need to create Ukrainian board because Russian board is already enough.