This document provides an overview of issues related to the South China Sea, including China's increasing assertiveness in the region, competing territorial claims among regional powers, and relevant international law. Specifically, it discusses China's historical claims to the South China Sea, its perspectives on controlling resources and securing sea lanes, recent military engagements and island building activities, and the ambiguous nature of its maritime claims. The document also outlines the positions of US allies in the region, including Philippines, Malaysia, Vietnam and Taiwan, and their views on applying international law to the territorial disputes.