Present day Israel is only a fraction of the originally mandated land for the nation of Israel. Nearby land surrounding Israel is unlawfully occupied by non-Jews.
Whatever law could you be talking about? Could you quote that law? Something can't be unlawful unless there is an applicable law.
Right back at you. A declaration is not a law, and Israel was cheated out of the mandate, but created by war when the neighboring arabs invaded the newly created nation. Much of TransJordan was promised to Israel by the Balfour Declaration but usurped by the arabs. The war made Israel a legal nation, recognized under law.