China has expressed "firm opposition" to remarks made by US Pentagon chief Jim Mattis during a regional defence summit over the weekend, after he criticised Beijing's "militarisation" of the South China Sea.

Washington has repeatedly expressed concerns that China's development of artificial islands in the region poses a threat to freedom of navigation through its waters, a major artery for international trade.

Competing claims to the sea, which is believed to sit atop vast oil and gas deposits, have for decades made it one of Asia's potential military flashpoints.

"The scope and effect of China's construction activities in the South China Sea differ from other countries in several key ways," Mattis noted, saying Beijing's "militarisation" and "disregard for international law" showed its "contempt" for other nations' interests.

In a statement late Sunday, Chinese foreign ministry spokeswoman Hua Chunying called Mattis's comments "irresponsible" and accused "certain countries outside the region" of making "erroneous remarks driven by ulterior motives".

"China has indisputable sovereignty over the (Spratly) Islands and their adjacent waters," Hua said, referring to reefs and islets in the South China Sea where Beijing has built installations that could be used by its military.

China's behaviour in the South China Sea, which is claimed in part by the Philippines, Brunei, Malaysia, Taiwan and Vietnam, has sparked broad concern in the region.

But in May, Beijing and the Association of Southeast Asian Nations (ASEAN) took a step towards easing friction over the sea, agreeing to a framework for a "code of conduct" to prevent incidents in the disputed waters.

Tensions over the Spratlys have also quieted down in recent months as new Philippines president Rodrigo Duterte has pursued friendlier relations with Beijing.

China has balked at US involvement in the dispute and last month accused a US warship of trespassing after it sailed near a reef claimed by Beijing.

Hua said China "respects and safeguards all countries' freedom of navigation and overflight" in the area "but definitely opposes certain country's show of force in the South China Sea under the pretext of navigation and overflight freedom, challenging and threatening China's sovereignty and security".

In addition to Mattis, Japanese defence secretary Tomomi Inada also took the opportunity of the summit to scold China for its "unprovoked, unilateral attempts to alter the status quo" in the East and South China Seas.

Beijing is involved in a simmering territorial row with Tokyo over the disputed Senkaku Islands, claimed by China as the Diaoyus.

"Remarks made by the Japanese side, which confuse right and wrong, are not worth refuting," Hua said in her statement.

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Australia's Turnbull warns against 'coercive' China
Singapore (AFP) June 2, 2017
China has nothing to gain by strong-arming its way in the Asia Pacific, Australia's prime minister said Friday, warning that a "coercive" Beijing would only face resentment in the region. Prime Minister Malcolm Turnbull, speaking at a regional security conference in Singapore, said it was inevitable that China play a bigger regional role to match its rising economic weight, but cautioned aga ... read more

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