JAKARTA – Indonesia “feels sabotaged” in its efforts to maintain peace in the disputed South China Sea and may bring its latest maritime altercation with China to an international court, a minister said on Monday.

Indonesia is not embroiled in rival claims with China over the South China Sea and has instead seen itself as an “honest broker” in disputes between China and the Philippines, Malaysia and Brunei.

But an incident on the weekend involving an Indonesian patrol boat, and a Chinese coastguard vessel and fishing boat in what Indonesia said was its waters has angered it and led to its questioning of its work to promote peace.

“We feel interrupted and sabotaged in our efforts,”fisheries minister Susi Pudjiastuti told reporters in Jakarta after meeting Chinese embassy officials to discuss the incident in the Natuna Sea, an area between Peninsular Malaysia and the Malaysian province of Sarawak on Borneo island. “We may take it to the international tribunal of the law of the sea,” Pudjiastuti said.

Pudjiastuti said the Indonesia patrol boat had fired warning shots in the air when it approached the Chinese trawler.

Indonesia’s Deputy navy chief, Arie Henrycus Sembiring, told the news conference the navy would send bigger vessels to back up its patrol boats in the region.

Indonesia says one of its patrol boats on Saturday attempted to detain a Chinese boat fishing illegally in its waters. Eight Chinese crew members were detained but the Chinese coastguard prevented Indonesia from confiscating the fishing boat.

On Monday, China’s foreign ministry repeated that the fishing boat was operating in “traditional Chinese fishing grounds”, again demanded the fishermen be released and added the Chinese coastguard vessel did not enter Indonesian waters.

‘NO OBJECTIONS’

China and Indonesia do not contest the sovereignty of the Natuna islands and the seas around them: both agree they are part of Indonesia.

Chinese foreign ministry spokeswoman Hua Chunying reiterated that on Monday. “The sovereignty of the Natunas belongs to Indonesia. China has no objections to this,” Hua told a regular briefing.

Any maritime disputes should be resolved by talks and China also opposes illegal fishing, Hua said.

Earlier on Monday, Indonesia protested to China against what it described as an infringement of its waters by the Chinese coastguard vessel. “We conveyed our strong protest (over)…the breach by the Chinese coastguard of Indonesia’s sovereign rights,” Foreign Minister Retno Marsudi told reporters after she met Chinese embassy representatives in Jakarta.

Pudjiastuti said the eight detained Chinese fishermen would be processed in accordance with Indonesian law.

China claims almost the entire South China Sea, a strategic shipping corridor, also rich in fish and natural gas, where several Southeast Asian countries also have overlapping claims.

While Indonesia and China are not disputing the South China Sea, tension between them does flare every now and then, usually over Chinese fishing boats.

In March 2013, armed Chinese vessels confronted an Indonesian fisheries patrol boat and demanded the release of Chinese fishermen who had been apprehended in Natuna waters.

Similarly, in 2010, a Chinese maritime enforcement vessel compelled an Indonesian patrol boat to release another illegal Chinese trawler.

Jakarta – A Chinese envoy called on Indonesia Monday to release eight crew members of a Chinese fishing boat detained during a maritime confrontation, after he was summoned by furious Indonesian ministers.

Jakarta says Indonesian vessels were on Saturday trying to detain a Chinese fishing boat operating illegally near Indonesia’s Natuna Islands in the South China Sea, when they were prevented from doing so by Chinese coastguard vessels.

However Sun Weide, China’s acting charge d’affaires in Jakarta, insisted that the incident occurred in “traditional Chinese fishing grounds”.

The two nations normally enjoy good relations and the flare-up in tensions is rare.

Indonesia does not have overlapping territorial claims with China in the South China Sea, unlike other Asian nations. But it objects to China’s “nine-dash line” defining its claims since it overlaps Indonesia’s exclusive economic zone around the Natunas.

Eight crew members of the Chinese fishing vessel were detained before the coastguards intervened, Sun said, and urged Jakarta to let them go.

“I asked the minister to release eight fishermen detained by Indonesia,” he told reporters after being summoned by Fisheries Minister Susi Pudjiastuti, who has been leading a crackdown on illegal fishing.

Foreign Minister Retno Marsudi also summoned Sun and lodged a strong protest, saying that the Chinese coastguards had entered Indonesian waters during the confrontation.

“There was a violation by the Chinese coastguard of Indonesia’s sovereign rights and jurisdiction in the exclusive economic zone and continental shelf,” she told reporters, reading the protest she had lodged with him.

The foreign minister said Jakarta had asked for clarification from the Chinese government about the incident.

Sun was summoned because the ambassador is currently in Beijing.

Indonesia in 2014 launched a tough crackdown on illegal fishing which involves sinking foreign vessels caught fishing without a permit in its vast waters, after impounding the boats and removing the crews.

Beijing voiced concern last year after Indonesia destroyed an impounded Chinese fishing vessel.

The Natunas are a string of islands rich in fish on the far northwest fringe of the Indonesian archipelago.

In Saturday’s incident, a Chinese coastguard boat initially collided with the Chinese fishing boat as it sought to intervene. A larger Chinese coastguard vessel then arrived and the Indonesians abandoned efforts to detain the fishing boat.

The nine-dash line is the demarcation Beijing uses on maps to demonstrate its claim to almost the whole of the South China Sea.

Tensions in the sea – through which one-third of the world’s oil passes – have mounted in recent months since China transformed contested Spratly reefs into artificial islands capable of supporting military facilities.