to put it simply, the taxes paid go to finance "whatever their government are doing".
also, do you think, like - all russians are against the war and don't have imperialistic mindset. it's just their government to blame? I'd say there is a decent part that got affected by propaganda both imprinted into education and news.
I don't know about the artists contributed to the journal (do you?), but in my opinion it is just a safer bet to find an artist unrelated to Russia.
apart from that, promoting russian culture (i.e works by russian artists) while it is actively destroying culture of other countries - means contributing to the process.
As I said, I don't make any claims about the artists in the topic. They may be good and intelligent people. I'm sorry if I expressed this point not clear enough.