The President is Jewish, yes. But there are Nazi elements to the Ukrainian military. For example, the Azov Battalion[1] are very clearly neonazis. But they were also one of the main forces fighting Russian separatists in the east, so they were adopted into the National Guard.
As everyone's noticed, the situation in Ukraine is complicated. Yes, Putin's claim that he's invading Ukraine to denazify it is clearly bs. BUT, Ukraine has a Nazi problem, largely due to the internal alliances the government has to make in order to stand a chance against Russia. If Putin managed to get Ukraine's military to coup their government and then negotiate with him, that coup would probably be from the neonazis. Luckily for Ukraine, it turns out so far that its White Nationalists still care about the "nation" part.
https://en.wikipedia.org/wiki/Azov_Battalion