Scarborough Shoal: The Next U.S.-China Showdown in the South China Sea
U.S. chief of naval operations Admiral John Richardson told Reuters on March 19 that the United States was monitoring increased Chinese activity around Scarborough Shoal. He warned, “I think we see some surface ship activity … survey type of activity … That’s an area of concern … a next possible area of reclamation.”
Satellite imagery from March 24 shows no Chinese dredging or construction activity at Scarborough Shoal. The only vessels present were a Chinese civilian ship anchored within the mouth of the lagoon, which has been typical for several years, and two Filipino trimaran-type fishing ships outside the shoal. But that does not mean that Chinese ships have not performed surveys in preparation for reclamation, as Admiral Richardson suggested.
Why Scarborough Shoal?
Given that Beijing is expected to lose at least part of the case that Manila has brought against it in the Permanent Court of Arbitration, China might take action to demonstrate that it will not be constrained by the court’s decision. Potential escalations include re-imposing a blockade of Filipino troops stationed at Second Thomas Shoal, deploying military assets to the Spratly Islands, or announcing an air defense identification zone over the South China Sea—but undertaking reclamation work at Scarborough Shoal would be particularly concerning.
Scarborough Shoal lies about 120 nautical miles from the main Philippine island of Luzon and 185 nautical miles from Manila. It is situated in an otherwise empty area of the South China Sea more than 250 nautical miles from each of the region’s two disputed island groups, the Paracels to the northwest and the Spratlys to the southwest. Were China to undertake reclamation at Scarborough, it would allow the Chinese military to maintain a presence throughout the South China Sea and even extend its reach over parts of the Philippine home islands. That would have enormous strategic implications for both the Philippines and the United States, which just negotiated U.S. access to five Philippine bases under the Enhanced Defense Cooperation Agreement.
Chinese land reclamation at Scarborough Shoal would present the Philippines and the United States with multiple challenges. From a security perspective, it would undermine perceptions of U.S. willingness to uphold regional security. This is particularly true because the Philippines lost access to Scarborough in 2012 after a failed U.S. effort to negotiate a mutual Chinese and Philippine withdrawal. An airfield or port at Scarborough would strengthen Chinese military capabilities in and around the South China Sea, as well as complicate U.S., ally, and partner planning for a crisis.
Reclamation at Scarborough would also carry enormous ecological costs. The arbitral tribunal will likely declare that the environmental devastation China caused with its reclamation in the Spratlys violated international law. Undertaking new reclamation at Scarborough would be another sign that Beijing is thumbing its nose at the court and the existing rules-based order more broadly.
From a diplomatic perspective, Scarborough reclamation might also be the final nail in the coffin for ASEAN’s stuttering efforts to diplomatically manage regional tensions. In the 2002 Declaration on the Conduct of Parties in the South China Sea, the ASEAN states and China explicitly agreed to refrain from only one thing: “inhabiting on the presently uninhabited islands, reefs, shoals, cays, and other features.” Reclamation at Scarborough would violate that cardinal rule; it would be a signal to the region that Beijing’s negotiations with ASEAN were a smokescreen—one which it no longer needs.
Crafting an Effective Response
Although Washington and Manila face constraints in responding to this type of “grey zone” tactic—in which China seeks to change the status quo without overt use of force, often employing civilian or paramilitary vessels—a coordinated three-part strategy could potentially deter reclamation. The security, environmental, and diplomatic costs of reclamation at Scarborough necessitate such a response.
The first step in countering Chinese reclamation is to ensure that Washington and Manila are sharing intelligence on potential Chinese actions. China’s preference has been to take advantage of regional states’ poor maritime domain awareness capabilities by presenting them with faits accomplis. Admiral Richardson’s statement to Reuters indicates that the United States is keeping a close eye on Scarborough Shoal, but statements from Philippine officials suggest they might not be briefed on U.S. intelligence. Both sides must not only collect intelligence, but share that information in order to response appropriately at the first sign of imminent reclamation.