Russian here, living in Russia. Not surprised about this at all. Actually, I predicted that this would happen. By starting the war, Putin has wiped out multiple perceived notions about Russia (the myth of the defender nation, the second-strongest army, and the "Tolstoyesvsky"-centered culture among them).
Paraphrasing Anton Chigurh: "If your culture brought you to this, of what use was the culture?"
I think this is a temporary sentiment. In my mind Bach and Beethoven are in no way associated with the Nazi regime, for instance.