Photos: China Building Artificial Islands in South China Sea

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Dredgers deposit sand on the northern rim of the Mischief Reef, located 216 km (135 miles) west of the Philippine island of Palawan, in this Center for Strategic and International Studies (CSIS) Asia Maritime Transparency Initiative satellite image taken on February 1, 2015 and released to Reuters on April 9, 2015. CSIS's Asia Maritime Transparency Initiative/Digital Globe/Handout/Reuters

BEIJING (Reuters) - China on Thursday sketched out plans for the islands it is creating in the disputed South China Sea, saying they would be used for military defense as well as to provide civilian services that would benefit other countries.

Chinese Foreign Ministry spokeswoman Hua Chunying told a news briefing that the reclamation and building work in the Spratly archipelago of the South China Sea was needed partly because of the risk of typhoons in an area with a lot of shipping that is far from land.

"We are building shelters, aids for navigation, search and rescue as well as marine meteorological forecasting services, fishery services and other administrative services" for China and neighboring countries, Hua said.

The islands and reefs would also meet the demands for China's military defense, Hua said without elaborating.

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Dredgers reinforce a site being constructed on the westernmost part of Mischief Reef, located 216 km (135 miles) west of the Philippine island of Palawan, in this Center for Strategic and International Studies (CSIS) Asia Maritime Transparency Initiative satellite image taken on March 16, 2015 and released to Reuters on April 9, 2015. CSIS's Asia Maritime Transparency Initiative/Digital Globe/Handout/Reuters

It's rare for China to give such detail about its plans for the artificial islands. The rapid reclamation taking place on seven reefs has alarmed other claimants and drawn U.S. criticism, including from Defense Secretary Ash Carter, who is visiting Japan and South Korea this week.

"The relevant construction is a matter that is entirely within the scope of China's sovereignty. It is fair, reasonable, lawful, it does not affect and is not targeted against any country. It is beyond reproach," Hua added.

China claims most of the South China Sea, through which $5 trillion in ship-borne trade passes every year. The Philippines, Vietnam, Malaysia, Brunei and Taiwan also have overlapping claims.

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All but Brunei have fortified bases in the Spratlys, which lie roughly 1,300 km (810 miles) from the Chinese mainland but much closer to the Southeast Asian claimants.

While China's new islands will not overturn U.S. military superiority in the region, workers are building ports and fuel storage depots as well as possibly two airstrips that experts have said would allow Beijing to project power deep into the maritime heart of Southeast Asia.

Western and Asian naval officials privately say that China could feel emboldened to try to limit both air and sea navigation once the reclaimed islands are fully established.

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At the southernmost feature, cargo is unloaded onto the shore of Mischief Reef, located 216 km (135 miles) west of the Philippine island of Palawan, in this Center for Strategic and International Studies (CSIS) Asia Maritime Transparency Initiative satellite image taken on March 16, 2015 and released to Reuters on April 9, 2015. CSIS's Asia Maritime Transparency Initiative/Digital Globe/Handout/Reuters

The U.N. Convention on the Law of the Sea does not legally allow for reclaimed land to be used to demarcate 12-nautical-mile territorial zones, but some officials fear China will not feel limited by that document and will seek to keep foreign navies from passing close by.

Jin Canrong, associate dean of the School of International Studies at Beijing's Renmin University, said that China probably felt it needed to give its side of the story following growing criticism from Washington over the reclamation.

"The motivation in giving an explanation is a good one, to set minds at ease," Jin said.

MISCHIEF REEF

Hua's comments came hours after a Washington-based think tank published new satellite images that show China is quickly reclaiming land around Mischief Reef in the Spratlys within an area the Philippines regards as its exclusive economic zone.

The work on Mischief Reef is China's most recent reclamation.

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A dredger operates at the southern entrance to the Mischief Reef, located 216 km (135 miles) west of the Philippine island of Palawan, in this Center for Strategic and International Studies (CSIS) Asia Maritime Transparency Initiative satellite image taken on February 1, 2015 and released to Reuters on April 9, 2015. CSIS's Asia Maritime Transparency Initiative/Digital Globe/Handout/Reuters

A March 16 image published by the Center for Strategic and International Studies (CSIS) shows what it said were a chain of small artificial land formations as well as new structures, fortified seawalls and construction equipment along Mischief Reef.

Several dredgers are also present while the entrance to the reef had been expanded, the CSIS Asia Maritime Transparency Initiative said on its website.

An image from Feb. 1 showed a Chinese amphibious transport naval vessel several hundred meters from the reef's entrance.

Surveillance photos taken of Mischief Reef in October and seen by Reuters showed no reclamation work.

Asked about Mischief Reef in light of the images, Carter said he did not want to speculate on China's future plans but added that the militarization of territorial disputes in the South China Sea could lead to "dangerous incidents".

"It's not just an American concern but a concern of almost every country in the entire region," Carter told reporters before leaving Japan for South Korea. He spoke before Hua's news briefing.

Philippine Defense Ministry spokesman Peter Paul Galvez urged China to dismantle the work on Mischief Reef, 216 km (135 miles) west of the Philippine island of Palawan, saying it would affect his country's national security.

China occupied Mischief Reef in 1995. The October photos showed two structures, including a three-storey building sitting on an atoll.

Photos: China Building Artificial Islands in South China Sea | World