Authors: Mina Chen, Danielle Kremer & Jaime Ocon
Welcome to the Weekly Security Review, where we highlight key military, security, and political developments around Taiwan in one straightforward summary!
This week, Taiwanโs legislature finalizes a supplemental budget focused on U.S. FMS programs, the military weighs deploying HIMARS to the outlying islands, and the Indigenous submarine Hai Kun completes weapons testing.

Taiwan’s Legislature Passes Scaled-Down NT$780 Billion Defense Budget
Taiwan’s Legislative Yuan on Friday, May 8, approved a special defence budget of NT$780 billion (US$25 billion). The vote ended 162 days of political gridlock, but the final figure falls well short of President Lai’s NT$1.25 trillion proposal. The result was shaped almost entirely by the two main opposition parties, the Kuomintang (KMT) and the Taiwan People’s Party (TPP), which together hold a legislative majority.

The KMT was originally divided between a NT$380 billion version supported by chairperson Cheng Li-wun and a NT$800 billion version backed by several KMT legislators. After several internal party caucuses and pressure from Washington, the party eventually acquiesced to NT$300 billion (US$9.7 billion) for a first round of US arms procurement and NT$480 billion (US$15.3 billion) for a second. The scope of permitted purchases under the NT$300 billion cap includes Paladin self-propelled howitzers, High Mobility Artillery Rocket System (HIMARS), ALTIUS unmanned loitering munitions, Javelin, and TOW-2B anti-armor missiles. The second tranche, with a ceiling of NT$480 billion, will consist of funding for future items that the U.S. government will issue Letters of Offer and Acceptance (LOAs) for. These are rumored to include additional Patriot and National Advanced Surface-to-Air Missile Systems (NASAMS) batteries, as well as other items.
The final budget is approximately 40% less than President Lai Ching-te’s original eight-year budget plan. Critically, the items cut from the proposal fall into two categories: commercial procurement (combined NT$100 billion) and domestic contract manufacturing (combined NT$250 billion). There are concerns that the budget cut could both undermine Taiwan’s air defense network and also hinder the development of Taiwan’s defense industry due to a lack of domestic defense contracts.

Army Plans to Forward Deploy HIMARS to Outlying Islands
Taiwanโs military reiterated its plans to deploy U.S.-made HIMARS launchers to the outlying islands of Penghu and Dongyin. Unnamed military sources from the Liberty Times say the move is intended to extend the reach of the islandโs long-range strike capabilities and push Chinese military forces farther away from Taiwanโs coastline.
Sources say the planned deployment could create a posture that would increase the tactical value of HIMARS by threatening Peopleโs Liberation Army (PLA) bases, airfields and staging areas along Chinaโs southeastern coast. According to the article, the core idea is to create a โdead zoneโ that would force the PLA to pull key forces at least 100 kilometers inland to reduce their vulnerability to Taiwanese precision strikes. By distributing long-range fires to offshore islands, Taiwan would complicate PLA targeting, preserve more warning time, and raise the cost of any attempt at a rapid amphibious assault.

Penghu is roughly 150 kilometers from Chinaโs Fujian Province, and specialized munitions such as Army Tactical Missile Systems (ATACMS) fired from HIMARS on the islands could reach PLA landing assembly areas in Quanzhou, Xiamen, and Zhangzhou. Dongyin, Taiwanโs northernmost territory, sits even closer to the Chinese mainland and could place additional PLA facilities in range, including naval ports, radar sites, and air defense positions.
Taiwan has already begun receiving HIMARS and ATACMS from the United States, and once all planned deliveries are complete, the military expects to field 111 HIMARS launchers and 504 ATACMS missiles. Sources within Taiwanโs Ministry of National Defense (MND) have reportedly also reserved space in a later procurement package for the Precision Strike Missile (PrSM), with a range of roughly 500 km. If acquired, the combination of HIMARS, ATACMS, and future PrSM would give Taipei a deeper fire network capable of threatening PLA staging areas, logistics nodes, and air bases across the Strait.
Indigenous Defense Submarine Completes Weapons Test
Taiwanโs first Indigenous Defense Submarine (IDS), Hai Kun (SS-711), has completed a major weapons system verification test on May 7. According to China Ship Building Corporation (CSBC), the trial was conducted on May 6 and involved the launch of two Mk48 Mod 6 Advanced Technology heavyweight torpedoes. The test was designed to oversee the vesselโs ability to detect, track, and engage a target using its combat system.
CSBC released video of the test showing the torpedoes leaving the tubes and the wire guidance system visible in the underwater footage. The test is a significant milestone for Hai Kun, which has faced delays caused by integration issues with foreign-made subsystems. The original plan called for delivery to the Taiwanese Navy in December 2025 but has since changed the delivery date to July 2026. The Mk48 Mod 6AT torpedoes will be the predominant weapons systems aboard the IDS. In 2017 and 2020, the U.S. announced separate FMS packages of Mk 48 Mod 6 torpedoes; as of the time of writing, both are considered โdelayedโ by the MND, in reports to the LY.
With the weapons trial complete, CSBC plans to continue preparing Hai Kun for dockside maintenance and subsequent testing.











































