Anything to help the people of Ukraine?

I am a german guy traveling through russia. I am aware that the travel ban is in place and that I am not doing the right thing. I just love traveling and I cant help myself. So I want to do something for the people of Ukraine, something to show my solidarity with them. I will be in St Petersburg tomorrow, then I will move to Moscow. I am willing to do anything, even get arrested in Russia for showing my solidarity with the people of Ukraine. Does anybody know of something I can do? Thank you for everything!