Ukraine is/was on rank 79 on the democracy index. This is not good, but somewhat democratic. Russia is a lot less democratic (rank 124). Supporting Ukraine means to me to supporting a somewhat democratic state against an invasion contrary to international law. Banning pro Russian opposition might be necessary in times of war. I am not happy about it, but it would be easy to oppose Zelensky if Russia would not fucking invade Ukraine. Until then, it is best to support Ukraine.