Will China-Philippines tensions make other South China Sea claimants more likely to speak up?

A clash between China and the Philippines in the South China Sea last weekend will make Southeast Asian nations a little anxious but it may make some governments more likely to speak up against Beijing's actions if tensions escalate, observers said.

Chinese coastguard ships intercepted and fired water cannons on August 5 to warn off a Philippine vessel that was carrying supplies for Filipino troops stationed at the Second Thomas Shoal in the contested Spratly Islands.

Manila summoned the Chinese envoy to the Philippines over the incident and called China's actions "illegal" and "dangerous", while its long-time ally the United States said the actions directly threatened regional peace and stability.

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China said it had implemented "necessary controls" to stop the Philippine ships, and that Beijing had "indisputable" sovereignty over the Spratly Islands.

It also claimed that the Philippine ships had "disregarded China's repeated dissuasion and warnings and attempted to transfer construction materials used for maintaining and repairing the ship, which has been grounded on the shoal illegally".

The Second Thomas Shoal is controlled by Manila but also claimed by Hanoi, Taipei and Beijing, which also claims the resource-rich South China Sea waterway almost in its entirety.

A Chinese Coast Guard ship launches what it says is a warning water cannon spray in the direction of a Philippine vessel as seen in a screen grab from a video released on August 8. Photo: China Coast Guard alt=A Chinese Coast Guard ship launches what it says is a warning water cannon spray in the direction of a Philippine vessel as seen in a screen grab from a video released on August 8. Photo: China Coast Guard>

Collin Koh, a senior fellow at the S Rajaratnam School of International Studies (RSIS) in Singapore, said the Philippines' neighbours were likely to have watched the incident unfold with some unease against a backdrop of repeated stand-offs between Beijing and Manila.

"[Southeast Asian countries] will certainly view that as something quite worrisome and see it as an uptick in tensions that seem to have built up," said Koh, who specialises in naval affairs in the Indo-Pacific. "They view that as potentially impinging upon regional peace and stability."