The Security Council nations all agreed that rules didn't apply to Security Council nations. The issue here is the UN has zero power to stop this and that's by design.
USA, EU members, Canada, Japan, Australia to start have a lot of power to make China think twice. SANCTIONS!
Start with small sanctions first and then a sliding scale if they keep going. But good luck getting them all in the same page, they'll try to cheat and cut backroom deals with China.
Nobody sanctioned USA when George W started two wars on a whim against global community. So, no, nobody is going to sanction China, for exactly the same reasons.