https://en.wikipedia.org/wiki/China%E2%80%93Myanmar_relation...
Libya and Syria: Same here, some 3rd parties are involved anyway. The question is if "the West" (I guess this is what you refer to) should/must/must not get involved as well.
Their recent diplomatic stance isn't about involvement, it's them calculating that involvement isn't worth it and signaling to the junta that they shouldn't be afraid of involvement.
The Junta government opposed them at every turn and doesn't like foreign investment.
I would suggest not continuing to fall for it. It's not that war and intervention can't ever do "some" good. It's that the people behind wars and interventions are never interested in actually helping people. It's purely for money and power.
What 3rd party involvement?
There are only 2 third parties doing anything.
Russia helping Assad to flatten his own country to the ground
And Turkey trying to at least deny them a complete victory by enforcing the Idlib pocket with its troops, and firepower on the ground.