The Philippines has asked the Netherlands-based court to rule in the case, which pits China against several South Asian countries with overlapping claims. The dispute has escalated tension in the region and sparked concerns of a military confrontation.
China has not taken part in the proceedings and rejects the court's jurisdiction in the matter.
The East Sea, spanning almost 3.5 million square km, with abundant natural resources and a key shipping lane for international trade, borders on China, the Philippines, Vietnam, Malaysia, Brunei, Singapore and Indonesia.
Manila is contesting China's historical claim to about 90% of the maritime territory, with its so-called "Nine Dash line" stretching deep into the maritime heart of Southeast Asia, covering hundreds of disputed islands and reefs, rich fishing grounds and oil and gas deposits.
The Philippines argues that China's claim violates the United Nations
Convention on the Law of the Sea and has restricted its rights to
exploit resources and fishing areas within its exclusive economic zone.
Reuters