Beijing has reacted angrily to the passage of a US warship near an island in the South China Sea, calling it "serious political and military provocation." The move could further strain relations between the superpowers.
The island is claimed by China, Taiwan and Vietnam, and 12 nautical miles is commonly accepted as constituting the territorial waters of a landmass.
China sent military vessels and fighter planes in response to the US' latest "freedom-of-navigation" operation, Foreign Ministry spokesman Lu Kang said, according to state news agency Xinhua. "Beijing will continue to take all necessary means to defend national sovereignty and security."
China's Defense Ministry responded in a statement Monday, saying that the actions of the US navy had seriously damaged the "political atmosphere" surrounding the development of military ties between the two countries. It added that it resolutely opposes the entry of US warships into Chinese territory.
The US does not recognize Beijing's claim to sovereignty over the Paracel Islands, which China has occupied and on which it is building fortifications.
"I believe the Chinese are building up combat power and positional advantage in an attempt to assert de facto sovereignty over disputed maritime features and spaces in the South China," Admiral Harry Harris, head of the US Pacific Command, said last week.
This is the second such operation since Trump took office, in a further strain to US-Chinese relations. On May 25, the USS Dewey guided-missile destroyer sailed less than 12 nautical miles from Mischief Reef, part of the disputed Spratly Islands in the South China Sea, south of the Paracels.
Last Thursday, Trump authorized a $1.3-billion (1.2-billion-euro) arms sale to Taiwan and the US administration imposed sanctions on two Chinese citizens and a shipping company for helping North Korea's nuclear and missile programs, as well as a Chinese bank accused of laundering North Korean cash.
Two days earlier, the State Department also put China on a list of the world's worst human trafficking offenders.
Beijing's island-building in the South China Sea
Satellite images show the extent and speed of China's land reclamation activities in disputed waters of the South China Sea. The new land masses are believed to be primarily military installations.
Image: CSIS Asia Maritime Transparency Initiative/DigitalGlobe
Runway
China is expanding the construction of its facilities on Fiery Cross Reef. Provided by the Asia Maritime Transparency Initiative (AMTI), this June 28, 2015 photo reveals Beijing has nearly completed a 3,000 meter (9,800-foot) airstrip, long enough to accommodate most Chinese military aircraft. Two helipads, up to 10 satellite communications antennas, and one possible radar tower are also visible.
Image: CSIS Asia Maritime Transparency Initiative/DigitalGlobe
Expansion
Reclamation on Fiery Cross Reef, which lies on the west side of the Spratly Islands, began in August of 2014 and its principal landmass was finished by November. Dredgers have created a land mass that spans the entire existing reef and is approximately 3,000 meters long and 200-300 meters wide.
Image: Reuters//U.S. Navy
Facilities
This picture taken last November shows construction work being carried out on Fiery Cross Reef. The reef reportedly already houses a helicopter landing pad, a 300-meter-long wharf, a harbor large enough to dock military tankers, barracks and artillery emplacements.
Image: CSIS, IHS Jane's
South Johnson Reef
This reef was one of the first facilities to finish principal land reclamation. This recent picture shows that a radar tower is nearing completion at the north end of the land mass. According to AMTI, a new large multi-level military facility has been built in the center of the island. Up to six surveillance towers are being constructed alongside four possible weapons towers.
Image: Asia Maritime Transparency Iniative
A naval base?
Beginning in early 2015, Mischief Reef - also located in the Spratlys - has undergone extensive reclamation activity. Experts say that the recent widening of the southern entrance to the reef, coupled with sightings of Chinese navy vessels, may suggest a future role for the reclaimed reef as a naval base. Taken on March 17, this image shows a chain of small land formations at the reef.
Image: CSIS Asia Maritime Transparency Initiative/DigitalGlobe
From reef to island
Significant construction on Gaven Reef began in 2014, with a total of 114,000 square meters of land already created. Satellite pictures show just how fast construction has progressed on the reef. A new artificial island was created between March (left) and August (right) 2014.
According to AMTI, China has had a troop garrison on Gaven Reef since 2003, which has included a large supply platform where ships can dock. Experts say a new main square building in the reef appears to be an anti-aircraft tower.
Image: AMTI
A standardized process
As seen in this image, the basic process of expanding these features involves dredging sand from the seafloor and dumping it onto the reefs. The structure is raised above the high water line, hiding the status of the bank or reef beneath. The sand is then smoothed out and workers surround the island with a concrete barrier to protect against erosion and storm surge, and begin construction.
Image: CSIS
'Historic rights'
China claims most of the potentially energy-rich waterway, through which $5 trillion in ship-borne trade passes every year. The US Pacific Fleet commander recently said China was "creating a great wall of sand" in the South China Sea, causing serious concerns about its territorial intentions. Beijing argues it is asserting its so-called "historic rights" to maritime resources in the area.
Image: DW
Territorial disputes
The Philippines, Vietnam, Malaysia, Brunei and Taiwan also have overlapping claims, which have led to territorial disputes in the area. Last summer, China's deployment of a massive oil rig in waters also claimed by Hanoi escalated tensions in the region, sparking a standoff at sea and violent anti-Chinese demonstrations in Vietnam.
Image: picture alliance/AP Photo
US concerns
Washington is concerned China's efforts carry a military dimension that could undermine the US' naval and economic power in the Pacific, and has weighed sending warships and surveillance aircraft within 12 nautical miles of the new artificial islands. Washington has repeatedly called on Beijing and others to end reclamation projects in the disputed waters, but Beijing rejects those demands.
Image: Getty Images/AFP/M. Abbugao
Ecological impact
The Philippines filed a formal plea at the UN last year, challenging Beijing's territorial claims. Manila said China's reclamation activities are causing "irreversible and widespread damage to the biodiversity and ecological balance of the South China Sea." It also claimed that the destruction of coral reef systems is estimated to cause economic losses valued at $100 million annually.
