What would they be able to do? They couldn't even oust Assad in Syria, and many many fewer casualties in the middle east became untenable politically. Spell out the details of what you think is possible to accomplish here?
It's not a guaranteed success but it would be sending a very strong signal. Better than nothing, perhaps
China could just as easily see as act of war or at very least, threatening their sovereignty. Maybe they sell their treasuries or restrict rare earths, or simply cut off supplies amongst their $400 Billion goods surplus with the US. I really don't think they'll allow themselves to be pushed around on this, out of general principle.