Sanctions will do a lot, but our community have a lot of power too.
This would be very similar to when the Black Lives Matter movement happened in US, collectively added banners on our websites about the movement.
I think this is the least we can do.
If anyone is open to collab on creating something like a no-war.js or similar to add a simple banner on websites, please ping me on @reimertz on twitter.
edit: tweaked idea regarding redirect / block of russian visitors after some feedback.