There are no alternatives, that is part of the problem. The UN was primarily created to prevent all-out war between the US and Russia... young people like me expect it to be more than that though.
In the past, as a result the US and various European nations have gone off on their own to engage in various conflicts, both in military actions and in economic sanctions, on sometimes extremely thin or nonexistent legal grounds.
That's unrealistic to expect here:
- there isn't much trade between Myanmar and the EU to sanction (and the bit that is can and will be covered by Russia and China)
- military action is out of the question since the US has more pressing problems to solve than a military junta - Taiwan and interior issues - and the EU is blocked by its 100% consensus requirements on foreign action, incompetent and underfunded armies and general instability
- generally, outside of human rights activists no one cares about human rights abuses, that is the sad and tragic reality.
- as for the UN: there isn't any hope for multilateral action any more there either, it's a dead paperweight. No single nation there acts on good faith and a sense of common humanity, everyone is just looking for their own interests.