Honestly, I wish the next step would be for NATO to step in and restore the country to a legitimate government. Between this, Syria, Lebanon, Ukraine, China, Israel, the world has been way too conivent with the destruction of democracy.
Also I think that the more sanctions are put from West to Belarus, the closer it gets to become another Russia state. I'm not sure if that's the outcome West wants to see.
This is plain and simple hijacking of an international flight and not “within bounds” at all. Laws are to be followed in principle, not just technical merit, these are not computer games.
About half of Belarus's trade is with Russia. All this would accomplish is making it 90%+ and deepen ties with Russia. Might as well suggest having Russia annex Belarus as a response to the situation.
What a country wants is not in general what those in power want.