i would support calls for lukashenko to quit. while not on the same level as the fascists in the middle east, he is an anachronism in europe that should not exist. unlike many of the countries in the region that are often labeled incorrectly, belarus is legitimately long overdue for a transition to democracy.
that said, belarus is in the russian sphere of influence, and i would oppose any sort of intervention for that explicit reason. the potential consequences of such a thing are far too destabilizing to even contemplate. the russians would be justified in intervening and escalating, and i would morally support them in doing so.
the eu may have a valid role to play in negotiation, but it should avoid the kinds of destabilizing actions that it took in ukraine.
we should, broadly, step back and let the russians deal with it - and they have every right to retaliate if we don't.