In his first major act as U.S. Secretary of State, Marco Rubio delivered a resounding message of solidarity to the Philippines while issuing a sharp rebuke to China’s aggressive activities in the South China Sea. During a call with Philippine Foreign Secretary Enrique Manalo, Rubio emphasized the United States’ “ironclad” commitment to its ally under the 1951 Mutual Defense Treaty. He also condemned China’s actions in the contested waters, labeling them as “dangerous and destabilizing” and in violation of international law.
Background of the Dispute
The South China Sea has been a longstanding source of tension in Asia, with overlapping claims from several countries. China asserts ownership of nearly the entire waterway through its controversial “nine-dash line,” a claim that encroaches on the exclusive economic zones (EEZs) of nations like the Philippines, Vietnam, and Malaysia. In 2016, the Permanent Court of Arbitration in The Hague ruled against China’s claims in a case brought by the Philippines. The tribunal declared that China’s actions lacked any legal basis, but Beijing has disregarded the ruling and continued its assertive behavior.
Scarborough Shoal, a strategic chain of reefs and atolls within the Philippines’ EEZ, has become a flashpoint for conflict. China has effectively taken control of the area despite its proximity to the Philippine coastline, leading to frequent confrontations between Chinese and Philippine vessels. A recent incident saw Chinese coastguard ships blocking a Philippine resupply mission to the Second Thomas Shoal, escalating tensions further.
Rubio’s Assurances to Manila
In his conversation with Manalo, Rubio conveyed unequivocal support for the Philippines. “An armed attack in the Pacific, including anywhere in the South China Sea, on either of their public vessels, aircraft, or armed forces—which includes their Coast Guards—would invoke mutual defense commitments,” the State Department stated. Rubio also criticized China’s behavior, saying it “undermines regional peace and stability and is inconsistent with international law.”
Manalo, reflecting on the conversation, highlighted the strength of the alliance between the two nations. “We discussed the importance of the PH-US alliance for the prosperity and security of the Indo-Pacific,” he noted. The Philippine official also reaffirmed Manila’s readiness to collaborate with Washington in addressing shared challenges and enhancing bilateral ties.
U.S. Strategy in the Indo-Pacific
Rubio’s commitment to the Philippines aligns with a broader U.S. strategy to counter China’s growing influence in the region. Shortly after assuming office, Rubio convened the Quadrilateral Security Dialogue (Quad) with representatives from Japan, Australia, and India. The Quad, seen as a counterbalance to Beijing, reaffirmed its support for a “free and open Indo-Pacific” where “the rule of law, democratic values, sovereignty, and territorial integrity are upheld and defended.”
Military cooperation between the U.S. and the Philippines has also intensified. Since 2023, the two nations have conducted multiple joint maritime exercises in the South China Sea. These drills emphasize freedom of navigation and aim to bolster the Philippines’ defensive capabilities. Under Philippine President Ferdinand Marcos Jr., who has pivoted toward closer ties with Washington, the U.S. has gained expanded access to military bases in the Philippines, including those near Taiwan.
China’s Assertive Posture
China’s expansive claims in the South China Sea have alarmed not only the Philippines but also other regional stakeholders. Beijing has dismissed international criticisms, maintaining that its actions are lawful and justified. Chinese Foreign Ministry spokeswoman Mao Ning recently stated, “Engaging in bloc politics and confrontations between camps will not bring peace and security, and is detrimental to the stability of the Asia-Pacific and the world.”
Despite these claims, the Philippines has pushed back against China’s actions. Earlier this month, Manila denounced the deployment of a massive Chinese coastguard vessel—dubbed a “monster ship”—within its EEZ. National Security Council spokesperson Jonathan Malaya called the move “illegal” and “unacceptable,” describing it as “an escalation and provocative.”
In response, the Philippine Navy conducted sovereignty patrols and live-fire exercises near the contested Scarborough Shoal. Joint exercises with U.S. forces followed, underscoring the allies’ resolve to defend Philippine territorial integrity.
Strengthening U.S.-Philippine Relations
Rubio’s outreach to the Philippines marks a critical moment in the evolving security dynamics of the Indo-Pacific. The State Department emphasized that the two countries are exploring ways to expand economic ties and deepen avenues for regional cooperation. Japanese Foreign Minister Takeshi Iwaya, visiting the Philippines last week, pledged to strengthen trilateral initiatives involving Japan, the U.S., and the Philippines, further solidifying the alliance against China’s assertive actions.
“Secretary Rubio’s remarks offer reassurance for the Philippines, which has sought continued security guarantees from Washington,” said an analyst familiar with U.S.-Asia relations. The renewed commitment comes at a time when tensions in the South China Sea are at their highest in years.
As the Philippines and the United States strengthen their alliance, the world watches closely. Rubio’s strong rhetoric and early actions signal that the U.S. is prepared to take a leading role in countering China’s influence in the South China Sea. For Manila, backed by Washington’s assurances, the path forward will require continued vigilance and strategic collaboration to navigate this high-stakes geopolitical landscape.
ACZ Editor: Will the bullying stop? You can bet that within a couple of months, China will test our resolve. Rubio had better have a strong but subtle plan, since a bad response to a provocation could escalate quickly.