Obviously this sucks, but it's also quite interesting. They call themselves American Banderites. Banderites were far right Ukrainian nationalists, but since WW2 the term has mainly been used by Soviet propaganda and by the Putin regime:

In propaganda the term has been used by Soviets after 1942 as a pejorative term for Ukrainians, especially western Ukrainians, or Ukrainian speakers; under Vladimir Putin-ruled Russia the term was used by state media as a pejorative for Euromaidan activists and Ukrainians who support sovereignty from Russia ... Today, in Russian propaganda, the word is used to refer to all in Ukraine who back the idea of sovereignty from Russia; Ukrainian nationalist collaboration with Nazi Germany is also emphasized

This is why Ukrainians sometimes call themselves Judeo-Banderites, as a joke about how many Jewish people support the supposedly Nazi regime in Kiev and its Jewish president. Obviously, Ukraine does have a far right, but they're incredibly marginalised:

Ukraine does have a far-right movement, and its armed defenders include the Azov battalion, a far-right nationalist militia group. But no democratic country is free of far-right nationalist groups, including the United States. In the 2019 election, the Ukrainian far right was humiliated, receiving only 2% of the vote.

This was a bit of a tangent, but it sounds like these kids may have been influenced by Russian propaganda. Certainly interesting how the far right is divided over Ukraine, with some supporting Russia and some supporting Ukraine, despite the whole Jewish president and relatively pro-LGBT thing.