Earlier quoted context omitted.
When the UN told the US not to go to war with Irak, they just ignored it. Those bodies have zero power and countries that want to massacre will kill no matter what.
Quite the contrary - they have all the power, they are just choosing not to use it in this case. If the court ordered a ceasefire all weapon shipments to Israel would have to stop the same day.
Israel has stockpiles of arms anyway. The war wouldn't stop just because the arms trade stopped.