As long as their demonstration is against military targets (and not what Israel would classify as a “military targets”), I say let them. Bomb every Russian military base within 200 miles of Ukraine into a crater. Russia only seems to respond to a show of force, unfortunately with its current leadership, so give it to them.
I just feel bad for the Russians who have to live under Putin’s rule. I know several Russians who have fled Russia to avoid drafts or persecution. Hearing them talk about how they “probably will never be able to go home again” is heartbreaking.