The document discusses the legality of using force against Syria under international law. It notes that unilateral or collective use of force would violate the UN Charter, which prohibits using force against sovereign nations, unless authorized by the UN Security Council or in self-defense. However, Russia and China would likely veto any Security Council resolution, and Syria has not attacked another country. While some argue humanitarian intervention or responsibility to protect could justify force, most experts say force against Syria without UN approval would currently be illegal under international law.