An international tribunal is set to give a long-awaited ruling, with implications for China's controversial claims in the disputed South China Sea.
The case at the tribunal in The Hague was brought by the Philippines, which argues Chinese activity in the region is against international law.
China claims almost all of the South China Sea, including reefs and islands also claimed by others.
China says the tribunal has no right to rule on the case.
The case is being decided by an arbitration tribunal under the United Nations Convention on the Law of the Sea (UNCLOS), which both countries have signed.