Israel don't recognize the authority of the International Criminal Court. Palestine, however, does, and therefore the ICC consider these allegations within their jurisdiction. A relevant point is that the UK (under the previous Conservative party government) requested the opportunity to dispute the allegations of war crimes based on this complication, but the new British government did not choose to continue with the objection. No other countries have made objections.

The challenge wasn't based on exactly that, they were trying to argue that a treaty palestine signed with israel precluded palestine from giving icc juridsiction that it didn't have itself.

That said, if it ever gets to trial, the defendants will almost certainly try to challenge it on that basis.

Realistically though i think the chance of that type of challenge succeding is unlikely. International courts generally are above domestic law. They probably have a better chance of convincing the court that palestine isn't a state and thus cannot sign the rome statue (which is also a long shot imo)

Good thing that's not how laws are formed - "your" not recognizing authority doesn't mean "you" haven't committed the war crimes or other illegal act that international organization has charged you with; so far it's worked that veto power can immediately suppress action even when the rest of the organized-civilized world is against you, where so far most international organizations have been for theatre - but where we have an opportunity for them to finally have teeth.

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