There is enough evidence about islamist battalion "Krim" and other squads. Some of them are even using a modified version of IS banner. Islamist and nazi squads are officially aligned with ukrainian ministry of internal affaies, only idiot would deny this simple fact.
https://www.youtube.com/watch?v=d5Q3Igp0VWEThere were reports in Russian language media that more than 300 Crimean Tatars have travelled to Syria, with the intention of joining the Islamic State. I don't know whether the neo-Nazi junta in Kiev is paying the travelling expenses and all, but some of them are saying that after undergoing the training in Syria, they will come back to Crimea to "liberate" it from the Russians.