Vietnam Ramps Up Island Building in South China Sea Amid Chinese Standoff

Vietnam has significantly stepped up its effort to expand islands and claim new land in the contested South China Sea since early 2024. This marks a notable escalation in a territorial competition that has defined this vital waterway for more than a decade.

Vietnam's acceleration comes years after China itself undertook massive land-building campaigns that shifted the balance of power in the Spratly Islands—a cluster of disputed reefs and islets that multiple countries claim. Between 2013 and the mid-2010s, China constructed artificial islands on seven contested sites, adding roughly five square miles of new land according to U.S. Department of Defense estimates.

The Pattern of Building and Military Expansion

China's construction effort peaked when U.S. officials reported China was reclaiming 1,500 acres of land in a single year. The scale was striking: China built runways stretching 3,000 meters long (nearly two miles), transforming barren reefs into military bases from which it could project power across the waterway.

China's government announced it had finished some of these projects. However, closer analysis showed China kept building despite these public statements saying work had stopped. This gap between announcements and reality became a recurring flashpoint with neighboring countries and the United States.

President Barack Obama called such land reclamation counterproductive and pushed for it to end, reflecting U.S. worries about the militarization of these disputed features. The Philippines formally objected to China's building spree, showing anxiety among Southeast Asian nations about Beijing's expanding presence.

What These Islands Can Do

The islands China built now serve as permanent military outposts. According to the 2021 U.S. Department of Defense China Military Power Report, these South China Sea bases can support sustained military operations and house advanced weapon systems, fundamentally changing how power is projected across the disputed waters.

China uses navy ships, coast guard vessels, and civilian boats to maintain a constant presence in contested areas, effectively blocking fishing and oil and gas exploration by rival claimants. This tactic—sometimes called "gray-zone" strategy—operates below the level of open conflict while asserting practical control over the territory.

The strategic value goes beyond the islands themselves. China's Yulin Navy Base on Hainan Island, located south of mainland China, houses submarines carrying nuclear ballistic missiles. The South China Sea islands China built serve as forward defensive positions protecting this critical strategic asset.

Vietnam's Response

Vietnam's decision to accelerate its own land reclamation since 2024 is a deliberate move in response to China's long-established presence. But Vietnam operates in a different context than China did when it began building: today, land reclamation is widely understood as connected to military control and territorial assertion.

The timing suggests Vietnamese leaders concluded that diplomatic protests and regional agreements alone would not stop Chinese expansion. Instead, Hanoi appears to be shifting toward creating "facts on the ground"—building physical presence to strengthen its territorial claims beyond just legal arguments.

This follows a pattern seen repeatedly in territorial disputes. When one side restrains itself while watching the other expand unchecked, eventually the first side starts building too. The Philippines experienced this in the 1990s when China began construction on Mischief Reef; Filipino protests followed, but China's continued expansion across multiple features eventually became the new normal.

Where This Leads

The broader context here is sobering. Vietnam's acceleration signals that the South China Sea dispute has shifted into a phase where physically transforming disputed features has become the main way countries push their territorial claims. This makes diplomatic solutions harder to reach through confidence-building measures and negotiated agreements.

Vietnam's move also shows the limits of international courts. The 2016 arbitration tribunal—a binding legal process—ruled against China's broad territorial claims. Yet the practical reality remains: physical control often matters more than legal rulings in territorial disputes.

The risk in Vietnam's acceleration is clear: other claimants, particularly the Philippines, might respond with their own building programs. A competitive spiral of land reclamation and construction could unravel existing tension-management mechanisms and raise the chances of accidents turning into conflict.

The deeper issue is this: as long as the basic sovereignty question remains unsettled, countries will view land building and construction as essential tools to protect their territorial positions. Vietnam's recent move reflects logic that has driven Chinese behavior for over a decade—without agreed rules to stop this competition, holding back puts you at a disadvantage.

Managing this rivalry without letting it erupt into direct confrontation remains the central challenge for the region. Real solutions would require addressing the underlying sovereignty disputes that fuel this behavior in the first place.