Some of us might see it as American hegemony not seeing the buffers ahead. As I have said before Russia and Iran have a legitimate presence in Syria. Any other invaders have declared war by illegal aggression.
The coalition no longer bother with proof or a UN mandate to legitimise their actions.
There have been rumours in the past of the Chinese deploying troops to Syria, although this has been denied.

But:

"While China has traditionally stayed out of the Syrian conflict directly, the Asian country has intervened to combat the spread of the Islamic East Turkestan network that has found its way to not only Syria, but Pakistan and Afghanistan.
Estimates suggesting that there could be around 2,500 of the foreign fighters in Syria aiding and assisting other jihadist elements within the war-torn Levantine country."