The U.S. Department of Defense’s latest assessment of the Chinese military provided new detail on China’s land reclamation efforts on several of the islets that it occupies in the South China Sea. These include Fiery Cross Reef, Gaven Reef, Johnson South Reef, Mischief Reef, and Subi Reef in the Spratly archipelago. By December 2014, the report estimated that China had reclaimed as much as 500 acres of new land, creating full-fledged islands where only coral reefs or sand spits existed before. Since then, China has only accelerated its efforts, expanding the total land area that it has reclaimed to 2,000 acres and building military facilities, ports, and at least one airstrip on the islands.
China is not alone in reclaiming land in the Spratly Islands. Though dwarfed by the massive scale of China’s efforts, Vietnam’s land reclamation work has recovered a total of 21 acres of land on West London Reef and Sand Cay. Satellite imagery shows that not only are the two islands larger, but that Vietnam has constructed defensive positions and gun emplacements on them.
Meanwhile, Taiwan is carrying out a more modestly-paced land reclamation effort on Itu Aba Island—the largest natural island in the Spratly archipelago—reclaiming roughly five acres of land. By the end of this year, Taiwan plans to complete a large wharf that can accommodate its frigates and coast guard cutters. Eventually, it hopes to extend the island’s runway and deploy P-3C maritime patrol aircraft there.
Hence, China regards criticism from Southeast Asian countries over its island-building activities as a case of the pot calling the kettle black. China’s Ministry of Foreign Affairs recently shot back at its most vocal critic, the Philippines, which it claims “has conducted large-scale construction of military and civil facilities, including airports, ports and barracks on [Philippine-occupied] islands for many years.” As a result, China called upon the Philippines to end its “malicious hyping and provocation.”
Accusations aside, bigger islands that are bristling with weapons will not settle the disputes in the South China Sea. No doubt military installations on the islands can be useful. They can improve the ability of claimants to monitor and rapidly respond to incidents in the area. And ultimately, they serve as a tripwire against hostile action. But further fortifying the islands makes them only marginally more secure. However strong an island’s defenses are, they are inherently vulnerable.
If push comes to shove, an island’s defenses can exact a toll on an attacker, especially if they are armed with anti-ship or anti-air missiles. But eventually they will be lost without control of the sea and air around them. A determined attacker that dominates both can always overcome an island’s defenses, no matter how skillful their defenders are. Only superior naval and air power can ensure the safety of island outposts. On that score, China has its rivals beat at the moment.
There once was a time when claimants in the South China Sea vied to demonstrate how their occupied islets met certain criteria to be considered islands under international law. That way they could claim the rights to exclusive economic zones around their specks of land. Today, a growing list of claimants, chief among them China, would rather build artificial islands than quibble over the finer points of international law. There is an out-and-out scramble to establish de facto zones of control and land reclamation is part of that.
 Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2015 (Washington, DC: U.S. Department of Defense, May 2015), p. 72; James Hardy, Sean O’Connor, and Michael Cohen, “China’s first runway in Spratlys under construction,” Jane’s Defence Weekly, Apr. 16, 2015.
 Gordon Lubold and Adam Entous, “U.S. Says Beijing Is Building Up South China Sea Islands,” Wall Street Journal, May, 9, 2015.
 Gavin Phipps and James Hardy, “Taiwan to deploy P-3Cs to Spratlys,” Jane’s Defence Weekly, Apr. 21, 2015.
 Ben Blanchard and Manuel Mogato, “China says Philippines violating South China Sea code,” Reuters, May 5, 2015.