The maritime security environment in the South China Sea is increasingly defined by rapid militarization and the normalization of gray zone tactics. According to data from the Armed Conflict Location and Event Data Project (ACLED), a persistent state of confrontation escalated dramatically in the first half of 2026, marked by an approximate 490 percent surge in Chinese force movements between January and June compared to the preceding six months. This intense activity has been heavily concentrated within the Exclusive Economic Zone (EEZ) of the Philippines, particularly around Scarborough Shoal, Sabina Shoal, and Thitu Island.
Su Mon, an Asia Pacific senior analyst at ACLED, and Tomas Buenaventura, a senior research assistant at the organization, have detailed how this spike in force movements—which includes survey vessels, China Coast Guard (CCG) deployments, and maritime militia—is frequently accompanied by hostile encounters. These incidents range from harassment and blocking maneuvers to competing law enforcement operations. Rather than simple displays of presence, these actions represent a coordinated effort by Beijing to alter the maritime status quo, advance its territorial claims, and consolidate control while strategically avoiding open military conflict. Consequently, the region has transformed into a primary theater for power projection where the margin for error is shrinking, raising the risk of a miscalculation that could trigger broader instability.
The primary danger of these gray zone operations lies in their ability to gradually normalize coercion. By utilizing persistent, incremental actions like the routine deployment of coast guard and militia vessels, Beijing is steadily shifting the baseline of "normal" maritime activity. Over time, these daily maneuvers accumulate into significant long-term strategic shifts. Data from ACLED’s South China Sea Monitor indicates that these gray zone tactics are also expanding into cyber warfare, intelligence operations, and suspected sabotage targeting critical infrastructure. This expansion underscores a growing asymmetry between China and other claimant states, highlighting a widening gap in regional governance as formal security and coordination mechanisms, such as the South China Sea Code of Conduct negotiations, fail to keep pace.
Tensions have remained particularly acute at Scarborough Shoal, where China has maintained de facto control since 2012 despite the feature lying within the Philippine EEZ. Beijing has kept a constant presence at the shoal, with CCG and militia vessels routinely blocking, ramming, and firing water cannons at Philippine ships. Relations deteriorated further after Beijing designated the shoal a national "nature reserve" in September 2025. While China framed the designation as an environmental protection measure, Manila condemned it as an attempt to establish administrative control. This move was followed by the deployment of floating barriers, buoys, and a temporary research platform, culminating in fresh confrontations on July 23-24, 2026, when the CCG again used water cannons against Philippine government vessels. This followed an earlier incident on August 20, 2025, when the Armed Forces of the Philippines documented a CCG vessel firing a water cannon near Second Thomas Shoal.
The broader Spratly Islands present an even more complex security landscape with overlapping claims from Brunei, China, Malaysia, the Philippines, Taiwan, and Vietnam. Second Thomas Shoal remains a highly volatile flashpoint. While an informal agreement reached in mid-2024 has temporarily reduced interference with routine Philippine resupply missions to the BRP Sierra Madre, China continues to block construction materials intended to reinforce the grounded outpost. A confrontation on July 22, 2026, at Second Thomas Shoal demonstrated that both nations remain locked in a dispute over what constitutes an acceptable military presence, with each side enforcing red lines that edge closer to crossing the other's.
This ongoing friction raises critical questions regarding the 1951 United States-Philippines Mutual Defense Treaty (MDT), which obligates both Washington and Manila to support each other in the event of an armed attack in the Pacific region. Because the treaty specifically designates an "armed attack" as the trigger for mutual defense, China has tailored its strategy around gray zone tactics. By utilizing close vessel confrontations, tailing, and blocking actions, Beijing pressures Manila while keeping the risk of direct U.S. military intervention at bay. However, the physical nature of these maritime maneuvers means the risk of a lethal accident remains high.
In July 2026, a highly publicized clash near Second Thomas Shoal resulted in a Philippine soldier being injured by a wooden baton. Despite the physical nature of the encounter, neither side resorted to actual firepower, which would have marked a definitive escalation and potentially prompted a heightened U.S. military presence in the disputed waters. Despite aggressive rhetoric, Manila and Beijing continue to communicate closely through diplomatic channels. Furthermore, strong economic ties between the two nations mean that neither currently desires an armed conflict. As long as these gray zone confrontations are kept within tolerable limits, they remain unlikely to draw the United States into an active regional war.
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