On August 27, 2025, the usually tranquil waters east of Scarborough Shoal in the South China Sea became a stage for a major show of international military cooperation. Australia, Canada, and the Philippines joined forces, deploying three warships and aircraft for drills against simulated aerial threats. The event, part of Exercise ALON 2025, was a clear signal of growing defense partnerships and a response to mounting tensions in one of Asia’s most contested maritime regions.
The Scarborough Shoal, a cluster of rocks and reefs claimed by both China and the Philippines, has long been a flashpoint. According to the Associated Press, Chinese forces have routinely used risky maneuvers in this area, trying to drive away Philippine aircraft and ships. The recent drills, conducted by the Royal Australian Navy’s guided-missile destroyer HMAS Brisbane, the Canadian navy frigate HMCS Ville de Quebec, and the Philippine navy’s guided-missile frigate BRP Jose Rizal, were not just routine exercises. They were a direct response to these ongoing challenges, and they unfolded just weeks after a dramatic incident involving Chinese vessels near the shoal.
The Philippine military reported that the exercises, which included an air defense drill to counter simulated aerial threats, concluded safely. There were no encounters with the Chinese coast guard, navy, or suspected militia ships, all of which have been closely guarding the uninhabited atoll for years. Video footage and photographs released by the Philippine military showed at least three fighter jets soaring above and two combat helicopters flying near the Philippine frigate. In a statement, the military said, “This engagement reaffirms the Armed Forces of the Philippines’ commitment to advancing defense cooperation with like-minded nations.”
Exercise ALON 2025 is the largest military exercise Australia has ever staged with the Philippines. More than 3,600 military personnel participated in 15 days of live-fire and battle maneuvers, with the drills set to wrap up on August 29. According to Rappler, approximately 1,600 Australian soldiers were involved, making this Canberra’s biggest deployment for such an exercise this year. Canada and several other security partners also sent military forces as observers, underlining the international interest in the region’s security dynamics.
Australia and the Philippines have a particularly close security and defense relationship, defined by agreements such as the Status of Visiting Forces Agreement and a strategic partnership. The two countries have agreed to talks and are working to expand military infrastructure cooperation. The drills themselves included not only the air defense exercise but also a photo exercise, all conducted within the Philippines’ exclusive economic zone.
The timing of these exercises is no coincidence. Just two weeks prior, on August 11, a Chinese navy ship accidentally collided with a Chinese coast guard vessel while trying to block a Philippine coast guard ship near Scarborough Shoal. The high-velocity crash severely damaged the coast guard ship’s bow, and according to Philippine military officials, may have killed at least two Chinese personnel based on video evidence. China has so far refused to provide details about the damage or possible casualties.
In the immediate aftermath of that collision, the U.S. Navy stepped up its presence. On August 13, two American warships—a guided missile destroyer and a littoral combat ship—sailed about 30 nautical miles (55 kilometers) from Scarborough Shoal in what the U.S. called freedom of navigation operations. These ships were shadowed by a Chinese navy vessel, but there were no reports of any untoward incidents, according to the Philippine coast guard. The United States, which has no territorial claims in the South China Sea, has consistently questioned China’s expansive claims in the region, including those to Scarborough Shoal.
The South China Sea is more than just a local dispute; it’s a vital global trade route, and the subject of overlapping claims by China, the Philippines, Vietnam, Malaysia, Brunei, and Taiwan. The Scarborough Shoal, in particular, has become one of Asia’s most sensitive flashpoints. Chinese officials have repeatedly warned they would defend the shoal and surrounding waters, which Beijing claims as its territory, “at all cost.” Yet, the Philippines, backed by its oldest treaty ally, the United States, has continued to assert its own claims. Washington has repeatedly warned that it is obligated to defend the Philippines if Filipino forces come under armed attack, including in the South China Sea.
The joint drills were not just a show of force; they were also a demonstration of unity. As the Philippine military put it, “This engagement reaffirms the Armed Forces of the Philippines’ commitment to advancing defense cooperation with like-minded nations.” For Australia, the exercise was an opportunity to deepen its strategic partnership with Manila and to demonstrate its commitment to regional stability. Canada’s participation, along with other security partners, underscored the growing international concern over the security of the South China Sea and the need for coordinated responses to potential crises.
Exercise ALON 2025 also highlighted the evolving nature of military cooperation in the region. The drills took place in Palawan, the West Philippine Sea, and Northern Luzon, reflecting the geographical breadth of the partnership. The scale of the exercise, with more than 3,600 personnel, speaks to the seriousness with which the participating countries view the security situation around Scarborough Shoal and the broader South China Sea.
For the Philippines, these drills are part of a broader strategy to strengthen its defense capabilities and to signal its determination to protect its interests. For Australia and Canada, the exercises are a chance to reinforce their presence in the Indo-Pacific and to support the rules-based international order. And for the United States, the events of August 2025 serve as a reminder of its enduring commitments in the region.
With tensions simmering and the risk of miscalculation ever-present, the joint naval drills off Scarborough Shoal mark a significant moment in the ongoing contest for influence and security in the South China Sea. The safe and successful conclusion of these exercises, coupled with the clear message of solidarity among the participating nations, will almost certainly reverberate far beyond the waves of the disputed shoal.