The Philippines said yesterday it planned to defy warnings from China and pursue a case in the United Nations challenging Beijing's claim to most of the South China Sea.
Manila will file its case tomorrow, which will allow the UN arbitration tribunal to study the Philippine argument that the Chinese claim covers parts of Filipino territory, officials said.
Abigail Valte, a spokeswoman for President Benigno Aquino, said the government was pursuing the case despite official Chinese warnings of a fallout in bilateral relations.
"At least for the Philippine government, we can say that all factors have been taken into consideration when the discussions were being had on the matter of the arbitration," she said.
China claims most of the strategically important body of water as well as islets and reefs which border major sea lanes and are reputed to sit on vast oil and gas reserves.
The Philippines sought UN arbitration in January 2012 to settle the dispute, but China has rejected the move.
China's foreign ministry spokesman Hong Lei warned Manila on Wednesday against proceeding with the UN case. "China will never accept nor participate in the international arbitration unilaterally initiated and pushed by the Philippines, and China's position has a solid basis in international law," Hong told a news conference in Beijing.
"We hope that the Philippine side ... returns to the right track of resolving the dispute through negotiation and consultation as soon as possible and stops going any further down the wrong track so as to avoid further damage to bilateral relations."
Valte said the Aquino government was aware that the UN tribunal may not be able to enforce its ruling if it decides against China.
"But assuming that a favourable decision for the Philippines is rendered, then at least that is additional weight for the Philippine position," she said.