Lably
Skip to content

Mutual Defense Treaty (United States–Philippines)

Defense treaty

  • 9 min read
  • 5 chapters

Related on Lably

Through World War II, United Nations and Dissolution of the Soviet Union

History

The Philippines became a US territory after the Spanish–American War and the subsequent Philippine–American War. In 1935, under the terms of the Tydings–McDuffie Act, the Philippines became a self-governing commonwealth, the Philippine Commonwealth, with full independence planned for ten years later. Delayed by World War II and the Japanese invasion and occupation of the Philippines, the Philippines became a fully independent sovereign state on July 4, 1946. Following independence, a strong US military presence remained, including a number of US military bases that were agreed in treaties between the countries. Some treaties created a strong bond between them that gave both countries rights not enjoyed by other nations. The Mutual Defense Treaty between the Republic of the Philippines and the United States of America was signed on August 30, 1951, in Washington, D.C. between representatives of the Philippines and the United States.

Philippine Defense Secretary Delfin Lorenzana ordered a review of the MDT on December 28, 2018, to "maintain it, strengthen it, or scrap it". On February 11, 2020, the Philippines notified the US that it would withdraw from the Visiting Forces Agreement, leading to speculation that the move could impact the MDT. It reversed its decision in June 2020.

In 2021, after the Philippines filed a diplomatic protest over a new Chinese law that may endanger Filipino fishers, US Secretary of State Antony Blinken reaffirmed the US commitment to the MDT. In a 2022 meeting, US Vice President Kamala Harris reportedly assured Philippine president Bongbong Marcos that "an armed attack on the Philippines armed forces, public vessels, or aircraft in the South China Sea would invoke US Mutual Defense commitments."

In September 2024, the United States Secretary of defense Lloyd Austin III reaffirmed its "ironclad" commitment to defending the Philippines after China's latest effort to assert its naval presence in the South China Sea.

In October 2024, The Philippine Navy and the United States Navy conducted joint anti-submarine and night patrol exercises as part of their Sama-Sama ("together" in Filipino) military drills. The exercises are designed to enhance the interoperability of the two navies and improve their readiness in maritime security operations. Japan, Australia, Canada, and France will join the exercises.

These naval maneuvers come amid heightened tensions due to the increasing presence of Chinese vessels, including warships, in the West Philippine Sea, part of the contested South China Sea. The drills are seen as a strategic response to rising security concerns in the region.

On November 4, 2024, Philippine Ambassador to the United States, Jose Manuel Romualdez, confirmed that the treaty compelling the United States to defend the Philippines in case of an armed attack would remain unchanged, irrespective of the outcome of the 2024 U.S. presidential elections. The agreement obligates both nations to come to each other's defense in the event of an external armed attack, reaffirming the longstanding military alliance between the two countries.

In December 2024 The United States deployed A-10 Thunderbolt II aircraft to the Philippines for joint training exercises with the Philippine Air Force, reinforcing their defense partnership.

Sign in to keep reading

4 more chapters are free with a Lably account.

More in History