I am changing my opinion here, people should go. This is simply theoretical as I’ll explain below, please consult your rav, parents and spouses for actual halakha.
There is a difference between punishment coming to us directly from Hashem and via cruel humans. In the first case, endangering yourself is pure rebellion against Hashem: you sent a virus but we don’t care. In the second case, it is legit to stand up to the reshayim, even to change how we tie our shoes, as ShA says… So, it may be a good thing to go to uman, daven for demise of reshayim and end of suffering they are causing. And bring some business and human worth to the locals.
Is there a danger? Only if russkies will decide to make a point and send a missile to the kever. Not something they can’t do. Or getting into a drunken confrontation with locals. They are probably armed this year as 2nd amendment is now adopted there. So be warned.