I have seen everything in my life. But what if the Russians taught the Ukrainians how to speak Ukrainian correctly... Yes, this is only on a humorous resource you will meet.
NNN: The usual thing. Ukrainians and sometimes Belarusians teach Russians all the way, speak Russian (not only on this resource). The French traditionally teach Americans how to speak English. The Poles are teaching the French how to correctly name the German concentration camps in Poland in French. The Israelis judge the New Zealanders, whom Israel itself has seen in the grave, and do not advise others to go there.
Have you noticed that this world is crazy?