The International Court of Justice in its 2004 unanimous opinion stated that Israel cannot justify its attacks against the occupied Palestinian territory as self-defense under the UN Charter and Article 51, since Gaza/Westbank are not a state yet. Or Dershowitz only cites arguments that support his case? What a lawyer.
Israeli ambassador to U.K.: Elements of left 'in denial' about 'disease' of anti-Semitism (Haaretz)
from the article: Israel's right to self-defense against Hamas