The U.K. had no good reason to cede the Chagos Islands, a militarily strategic archipelago, to Mauritius.

By John Bolton

As a one-term president, Joe Biden appears eager to take actions he might not have taken if he had to worry about getting re-elected. The latest example: He apparently pushed the U.K. to cede sovereignty of the Chagos Islands in the Indian Ocean to the island country of Mauritius. The Chagos archipelago is unremarkable but for one key fact: Diego Garcia, its largest island, houses a critical U.S.-U.K. military base near the Indian Ocean’s geographic center point.

British media report that U.S. officials, fearing that existing International Court of Justice rulings and a potential push in the United Nations General Assembly would pose political problems, pressured British Prime Minister Keir Starmer to cede them on Oct. 3. Whatever Mr. Starmer’s motivation—whether to appease Mr. Biden or lessen guilty feelings about imperial history—the decision was utterly misguided.

The Chagos “problem” hasn’t figured prominently in British politics before now, except in certain Labour Party circles. Jeremy Corbyn, Labour’s leader before Mr. Starmer, obsessed over the issue, long a priority for Labour’s Trotskyite wing. Worried about disapprobation by biased global courts, the White House and State Department during Mr. Biden’s term fell in sync with Britain’s Corbynites.

Under the deal, Diego Garcia will remain under British jurisdiction for at least 99 years. The site is home to a critical U.S. military facility, fittingly nicknamed the “footprint of freedom.” The island will only become more important to U.S. resistance against China’s efforts to achieve hegemony in the Indo-Pacific.

Mauritius, meantime, is increasingly China-friendly. China is its top trading partner, and Beijing has used debt-trap diplomacy—lending with strings attached—to ensnare the island nation. If the British Parliament approves transferring the Chagos to Mauritius, China will be able to maneuver ships and planes near Diego Garcia for intelligence-gathering and military operations. Given Beijing’s history of militarizing comparable tiny landmasses in the South China Sea, the threat is clear.

China has long conducted extensive undersea surveys of the Indian Ocean, ostensibly for commercial reasons but obviously in pursuit of maritime dominance. A Beijing presence in the Chagos will facilitate these efforts, posing a direct threat to India, which it appears wasn’t consulted by either Whitehall or Foggy Bottom.

There’s no compelling logic for ceding the islands to Mauritius. That the Chagos are associated with Mauritius is actually a fluke of colonial administration: France was Mauritius’s first colonial European power, governing the islands from the larger chain after taking control in the early 1700s. Britain acquired Mauritius after victory in the Napoleonic Wars and continued France’s governing mode. Many alternative solutions for the islands are available, but neither Washington nor London have shown an appetite for considering them.

The U.S. faced analogous challenges in ending its administration of the Trust Territory of the Pacific Islands, or TTPI, during the 1980s and ’90s. Once German colonies, the islands became a Japanese mandate under the League of Nations, and, after 1945, a U.N. trusteeship under U.S. control. One part of the TTPI, the Northern Marianas, became an American commonwealth. Three others—Palau, the Marshall Islands and Micronesia—chose independence but entered into Compacts of Free Association with the U.S., giving Washington authority over their foreign and security policies.

For all the overblown rhetoric about a British “diplomatic success,” it seems no one bothered to ask Chagossians their views. Given Mauritius’s prior poor treatment of Chagossians, Chagossians might have preferred to have become a U.S. commonwealth.

China has already tried to take advantage of Washington’s inattention in the former TTPI by aggressively pressing its interests and intentions and using debt-diplomacy tactics. Although Washington is now pressing back against Beijing, we can’t afford to make similar mistakes in the Chagos or the broader Indian Ocean.

Messrs. Biden and Starmer have checked the Chagos Islands off Mr. Corbyn’s to-do list. Let’s hope there aren’t any other foreign-policy surprises in Mr. Biden’s remaining lame-duck period.

Mr. Bolton served as White House national security adviser, 2018-19, and ambassador to the United Nations, 2005-06. He is author of “The Room Where It Happened: A White House Memoir.”

This article was first published in the Wall Street Journal on October 16, 2024. Click here to read the original article.