Imagine the Arab League trying to get an entity, which they don't even recognize, to sign an agreement. How do you get a country which doesn't exist to sign a treaty? Maybe they should recognize Israel and normalize relations with it first. Or is it only this non-entity which is supposed to make all the concessions? On top of that, where's all the pressure on Iran to abide by the agreement it DID sign? Should Israel sign the NPT then act the way Iran did? What does Israel get out of any of the concessions they demand? More demands?
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from the article: UN nuclear watchdog seeks to persuade Israel to join NPT