China reacted furiously to the verdict by a UN-back tribunal on Tuesday, insisting it will ignore the decision while warning its rivals too much pressure on the issue could turn the resource-rich and strategically vital waterway into a "cradle of war".
The Philippines, which launched the legal challenge, had initially refrained from asking China to abide by the ruling. This followed President Rodrigo Duterte's directive to achieve a "soft landing" with the Philippines' much more powerful Asian neighbour.
"Secretary Yasay will discuss within the context of ASEM's agenda the Philippines' peaceful and rules-based approach on the South China Sea and the need for parties to respect the recent decision," the foreign affairs department said in a statement. Even just raising the issue at the two-day summit starting tomorrow will anger China, which has long bridled at Philippine efforts to have the dispute discussed at multilateral events.
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But China appears to be in the minority - Japanese Prime Minister Shinzo Abe also said today as he left for Mongolia that he wanted to discuss the South China Sea at the summit.
China claims nearly all of the sea - which is of immense military importance and through which about USD 5 trillion worth of shipping trade passes annually - even waters approaching the coasts of the Philippines and other Southeast Asian nations.
China justifies its claims by saying it was the first to have discovered, named and exploited the sea, and outlines its territory using a vague map made up of nine dashes that emerged in the 1940s. However the tribunal, in The Hague, ruled China's claimed historic rights to resources within the nine-dash map had no legal basis.