Hitler disavowed Bandera first, the Nazis had no use for them.
There were also Russians (General Vlasov), that will willing to fight alongside the Nazis, but also, Hitler declined their help.
It’s pretty lame when someone commits genocide against his own people in a desperate attempt to appeal to Nazis, and even the Nazis won’t have him. But the fact that the Banderites WANTED to be Nazis and believed in the Nazi cause, even after being sent to a concentration camp should speak volumes.