Ukraine having a pretty open white nationalist problem is well documented as others have noted below. But what I wanted to add is that this has real implications for the world. Sending funding and training to white nationalists will increase the impact of their global network of hate and violence. For example, the Christchurch shooter went to Ukraine and met with (and potentially trained with) Azov prior to committing his mass shooting. Additionally, there was a recent case of Italian white nationalists that trained with Polish paramilitaries and were in contact with Azov and Right Sector planning a terror attack in Italy similar to the one in New Zealand.

To summarize since libs hate reading: White nationalism is a global network that the US is pumping billions of dollars of weapons in to and will surely result in tons of terrorist attacks as capitalism continues to enter crisis.