Troubled waters: conflict in the South China Sea explained

John Rennie Short, University of Maryland, Baltimore County

This article was updated on July 12, 2016.

The Permanent Court of Arbitration in The Hague today undercut China’s claim to maritime territory in the South China Sea by ruling that China’s claims have no legal basis.

The case was first brought to the court by the Philippines in January 2013. The country argued that under the U.N. Convention of the Law of The Sea (UNCLOS) the Chinese did not have the right to its vast maritime territorial claims in the South China Sea, its reclamation schemes did not constitute legitimate islands and its activities were damaging the marine environment and violating the Philippines’ sovereign rights. The court decided in favor of the Philippines.

The court’s ruling will strengthen the claims of other countries in the South China Sea against Chinese maritime expansionism. The court’s decision is celebrated in Vietnam.

China will ignore the ruling. All along it has claimed the Permanent Court of Arbitration did not have jurisdiction. However, the court’s decisions and the Chinese policy of nonparticipation and nonacceptance shake their standing as a member in good standing of an international community bound by rules of order and international treaties. China will snub the legal international order and seek bilateral negotiations with the Philippines.

The Philippines has gained from the court ruling by drawing international attention to China’s claim and activities in the region. Since the court had no powers of enforcement, the Philippines’ victory is a legal one but unlikely to lead to a Chinese back down.

The ruling does not make diplomacy any easier for the U.S., which now has to deal with an ally who has won a legal decision but also a rival who will not back down under the muscular pose of President Xi Jinping, even after the court ruling.

What is the background to these tensions and what are their likely implications and consequences?

Reassertion of global status

In recent years, China has been asserting claims in the region and has built up atolls and islands to be large enough to stage military exercises. This region is of major economic and geopolitical significance, with its vital commercial shipping lanes, rich fisheries and massive natural gas and oil deposits.

China’s economic success is obvious. In the past 25 years, it has grown to become the second-largest economy in the world, lifting millions out of poverty in rates of economic growth unparalleled in the modern world.

But it is crucial for non-Chinese to remember that China’s leaders see international political standing, not only economic clout, as an important issue. Heightened global stature not only makes up for a century when China was on the wrong end of asymmetrical relations with other powers, especially Japan, and subject to dismemberment and annexations, but it also reclaims China’s position as one of the world’s preeminent centers of power and influence.


The Philippines chose to challenge China’s claims to the Scarborough Shoal, the green dot west of Manila on this map, through the U.N. rather than bilateral talks.
Screen shot of Google Maps.

China claims a wide swath of territory in the South China Sea. It is often shown on Chinese maps as nine dashes and, indeed, referred to in those words.

Laws and zones

Exclusive Economic Zones (EEZs), first introduced in the 1982 U.N. Convention on the Law of The Sea, are areas where states can claim exclusionary rights over marine resources. They have a limit of 200 nautical miles (370 km) from the coastal baseline, the seaward edge of its territorial sea.

Where EEZs overlap, as is the case in some parts of the South China Sea, it is up to the neighboring states in question to delineate the maritime border.

Matters are made more complex when small islands – rather than a coastline or continental edge – are used to define a nation’s EEZ and are claimed by more than one country. A country can establish territorial sea up to 12 nautical miles from a naturally formed island and from there can claim a 200-nautical-mile EEZ.

Part of China’s strategy in the waters of the South China Sea then is to lay claim over islands, natural and artificial, in order to establish sovereignty to claim the surrounding waters.

Many islands in dispute

China’s territorial claim overlaps with the EEZs of Vietnam, the Philippines, Malaysia and Brunei. There are a number of ongoing disputes over the islands in the South China Sea.

The Paracel Islands, for example, are claimed by both China and Vietnam. When China moved a giant oil rig to the region in 2013, it was seen as a direct threat by the Vietnamese and undermined China-Vietnam relations. The Chinese have built a surface-to-air missile defense system on Woody Island, one of the largest of the Paracel Islands, and recently added a helicopter base to Duncan Island.

The Scarborough Shoal, a 60-square-mile chain of rocks and reefs, is claimed by both China and the Philippines.

In 2012 China took effective control by reconstructing seven islands. Control over the islands in the shoal allows China to monitor U.S. military activity.

It was these actions that prompted the Philippines to take the matter to the court in the Hague in 2013, rather than pursuing bilateral discussion. The Philippines, unlike other states in the region, has fewer economic ties with China and close military ties with the U.S. Today’s court ruling firmly denies China’s claim to an EEZ based on its activities in the Scarborough Shoal.

The election of a new president may, however, herald a new change in Filipino-Chinese relations. Benigno S. Aquino III has suggested the U.S. would need to respond militarily if China develops the shoal to maintain credibility in the region. And incoming President Rodrigo Duterte has said he’s open to direct negotiations with China.

And then there are the Spratly Islands, more than 740 reefs, islets, atolls and islands, to which six countries lay claim: China, Vietnam, Taiwan, Malaysia, Brunei and the Philippines.

And all but Brunei have built or claimed outposts there. However, China’s activity has ramped up since 2013, when it started to build on existing rock outcrops and reefs to create 2,900 acres of new land.

Vietnam and the Philippines have undertaken similar ventures, but China has outpaced every other country combined. Sand is pumped up from the sea floor and spread across islands and even the live coral of submerged reefs that are then concreted over to become bases capable of providing docks for ships and runways for planes. Military runways have been built on Mischief Reef and Subi Reef. In other words, the Chinese have militarized the disputed islands. However, today’s court ruling states that Mischief Reef, Second Thomas Shoal and Subi Reef were submerged at high tide in their natural condition and don’t generate a 12-nautical-mile territorial sea or EEZ.

Pivot to Asia

China’s claim to Scarborough Shoal always lacked any connection with current laws of the sea; I would interpret it as a claiming of world power status and importance. After today it no longer has any international legal authority.

The Chinese look around the region and see the projection

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