T-DOME: A Multi-Layered Defense System and Israel’s Role in Reshaping Deterrence in the Taiwan Strait

President Lai Ching-te National Day address on October 10, 2025, marked a clear shift in priorities compared to his previous speeches. It reflected a more cautious and pragmatic approach to cross-strait relations, alongside stronger emphasis on domestic national identity, national defense and internal security, and Taiwan’s global standing. This contrasted with the previous year, when his remarks strongly underscored Taiwan’s willingness to cooperate and build confidence with Beijing and neighboring countries, including contributing to resolving the Russia–Ukraine war and conflicts in the Middle East.

This year, Lai’s focus was largely confined to highlighting Taiwan’s global and economic importance, particularly after it surpassed the other Three Asian Tigers in economic growth rates. At the same time, he called on China not to distort UN General Assembly Resolution 2758 or the historical record of World War II. These positions were articulated against the backdrop of continued warnings by Chinese President Xi Jinping regarding “separatist movements” toward Taiwan, and parallel pressure from the United States on Taipei to shoulder greater responsibility for its own defense. In this context, Lai announced Taiwan’s continued pursuit of “peace through strength” by enhancing a new air defense system (T-DOME) as a measure to confront any potential move against the island.

What is the T-DOME system?

T-DOME represents a modern air and missile defense system designed to strengthen deterrence against potential Chinese attacks. It provides multi-layered protection, advanced detection capabilities, and effective interception operations. In terms of its general function, the project resembles the logic of Israel’s Iron Dome system, though it differs in technical architecture and operational integration.

T-DOME is expected to rely on the integration of existing systems such as U.S. Patriot missiles and Taiwan’s indigenous Sky Bow systems, alongside early-warning radars and advanced command-and-control networks. This integration would enable a relatively high level of defensive protection against limited and graduated air strikes. However, it does not constitute a comprehensive shield against massive missile barrages or large-scale long-range strikes by a major power such as China.

Functionally, the system is viewed less as a guarantee of complete interception and more as a tool to enhance deterrence by raising the cost of any potential attack.

The estimated cost of the system is around 400 billion New Taiwan dollars (approximately USD 12.8 billion). This figure reflects a qualitative shift in Taiwan’s defense spending priorities, as it represents roughly one-third of the proposed defense budget of 1.25 trillion New Taiwan dollars. This indicates a long-term political and financial commitment to building advanced air defense capabilities. The project is scheduled to be implemented over eight years, through 2033. As Lai noted in his speech, defense spending is set to rise to 5% of GDP by 2030.

These costs do not apply to a single system alone, but rather to a comprehensive restructuring of Taiwan’s air defense network, integrating existing systems with new domestic and foreign acquisitions. This includes additional interceptor systems, accompanying missiles, and advanced digital command-and-control infrastructure.

Such a level of expenditure suggests that Taiwan is not seeking direct military superiority but rather aims to raise the cost of any potential air attack by enhancing early interception and multi-layered response capabilities. Reliance on a mix of domestic and imported systems also entails ongoing financial burdens related to upgrades, maintenance, and operations, making T-DOME a long-term defense project rather than a short-term response to immediate threats. It reflects a strategic shift toward redefining Taiwan’s concept of air deterrence within the broader equations of regional security.

Taiwan–Israel Relations

The secret visit by Taiwanese Deputy Foreign Minister François Wu to Israel in late 2025 carries particular significance. It reflects a growing Taiwanese recognition of the potential to benefit from Israeli military expertise, especially lessons learned from the Gaza war in building deterrence and interception capabilities against China. Taiwan’s reception of Israeli political delegations, along with public statements drawing parallels between the threats faced by Taiwan and those confronting Israel, point to the emergence of a shared security narrative used to justify such cooperation.

Beijing, however, views this trajectory as a direct violation of the “One China” principle and an intrusion into its sovereign affairs, particularly given what it perceives as Israeli technical and military support enhancing Taiwan’s defensive capabilities. Accordingly, Taiwan–Israel cooperation cannot be understood in isolation from the repercussions of the Gaza war and the deterioration of Chinese-Israeli relations, especially considering China’s pro-Gaza stance and Taiwan’s efforts to leverage Israeli expertise to offset the imbalance of power with China.

This cooperation has thus become part of a broader web of strategic interactions reshaping regional and international security equations, particularly following the pager explosion incident in Lebanon in September 2024. That incident helped cement the linkage between Taiwan and Israel in global media narratives, as reports alleged that Israeli agents infiltrated the supply chain of Taiwan-branded pagers used by Hezbollah, which were linked to the explosions of September 17, 2024.

Available indicators suggest that Taiwan–Israel relations are undergoing a qualitative shift from informal engagement toward advanced technological and security cooperation with strategic dimensions shaped by U.S.–China rivalry and global geopolitical transformations. Despite the absence of formal diplomatic recognition, this rapprochement is manifested in the development of Taiwan’s multi-layered air defense system (T-DOME), which displays clear structural and functional similarities to Israel’s Iron Dome. This points to the transfer of expertise and technical interaction in radar systems, interception technologies, and air battle management.

Such cooperation is further reinforced by the presence of reciprocal representative offices in Taipei and Tel Aviv, providing an institutional framework that enables intensified coordination in technology and defense without reaching the level of full diplomatic relations—explaining the sensitivity of the Chinese position toward this relationship.

In this context, Taiwan–Israel rapprochement gains an additional dimension supported by assessments from Israeli experts, who acknowledge a structural complementarity between Israel’s advanced startup-driven innovation ecosystem and Taiwan’s growing industrial and technological base, particularly in semiconductors. This complementarity is viewed as a pragmatic response to rapid shifts in global trade dynamics, where access to reliable and capable partners has become critical amid geopolitical disruptions and fragile supply chains.

Rafael Kahan, a technology correspondent for Ynet, has noted that Taiwan’s outreach to Israel falls within broader efforts to form a technological alliance against what is perceived in Israel as a rising Chinese threat. He suggests that such cooperation could take the form of integrating Israeli industries into partnerships with the United States, potentially paving the way for a trilateral technological alliance more resilient to Chinese pressure.

This perspective also highlights the strategic importance of Taiwan’s industrial capacity, which Israel lacks particularly in scenarios of global supply-chain disruption amid escalating trade wars and growing Israeli diplomatic isolation. It reflects an increasing Israeli awareness of its vulnerability within the international economic system after the Gaza war, helping to explain internal calls, including by Prime Minister Benjamin Netanyahu, to reorient the Israeli economy toward greater self-reliance.

Accordingly, openness toward Taiwan should not be understood as a purely technical option, but rather as part of a broader strategy to reposition Israel within alternative technological and industrial networks, where security considerations intersect with the imperatives of economic sustainability in an increasingly rigid and polarized international environment.

At the international level, this trajectory acquires broader significance considering Chinese-American competition, where Taiwan is positioned as a central link in the regional deterrence equation. Washington’s implicit support for enhancing Taiwan’s defensive capabilities most recently reflected in U.S. approval of an arms sales package to Taiwan exceeding $11 billion alongside the involvement of advanced technological actors such as Israel, reflects a growing pattern of security networking through informal partnerships. This pattern is likely to expand within the international system in the coming phase. Such a trend may lead to the diffusion of similar defense models across other conflict zones, thereby intensifying the militarization of international interactions and weakening prospects for building stable collective security arrangements.

Conclusion

Taiwan’s T-DOME system cannot be viewed as an isolated technical defense project, but rather as a strategic development with implications extending beyond the Taiwan Strait to the structure of the international system itself. The launch of a multi-layered air defense system of this financial and technical scale signals Taiwan’s transition from traditional reliance on U.S. defensive guarantees toward a deterrence model based on raising the cost of attack.

This shift reshapes the balance of power in one of the most sensitive flashpoints in the global system and is likely to push China to reassess its military strategies—either by strengthening its offensive missile capabilities or by investing in means to penetrate air defense systems. Such dynamics open the door to a qualitative arms race in East Asia, driven not merely by quantitative accumulation, but by technological superiority and systems integration.