THREAT ASSESSMENT: Erosion of U.S. Security Guarantees and Taiwan’s Strategic Pivot to Europe

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If U.S. arms delivery timelines remain constrained by stockpile shortages and political uncertainty, Taiwan’s pursuit of European defense partnerships is likely to accelerate, reshaping regional supply chains and increasing exposure to secondary sanctions.
Bottom Line Up Front: The erosion of reliable U.S. security commitments to Taiwan—driven by political volatility, military overextension, and transactional foreign policy—poses a high-probability threat to regional stability, prompting Taipei to accelerate asymmetric defense capabilities and deepen defense-industrial ties with Europe, creating both strategic opportunities and escalation risks for the EU. Threat Identification: The primary threat is the weakening credibility of U.S. security assurances to Taiwan, exemplified by President Trump’s characterization of arms sales as 'negotiating chips' and the pause on a $14 billion arms package due to munitions shortages from Operation Epic Fury [SWP, 2026]. This creates a strategic vacuum that China may exploit, while forcing Taiwan to diversify its defense partnerships beyond the U.S. [SWP, 2026]. Concurrently, Europe’s nascent defense cooperation with Taiwan risks Chinese economic retaliation but is framed as essential for technological resilience and global trade security. Probability Assessment: High likelihood within 12–24 months. U.S. munitions stockpiles remain critically depleted, with Tomahawk missile deliveries to Japan already delayed by up to two years, signaling sustained supply constraints [Financial Times, cited in SWP, 2026]. Internal U.S. political divisions—between Rubio’s hawkish stance and Vance’s isolationism—suggest continued policy unpredictability [SWP, 2026]. Europe-Taiwan defense collaboration is already underway, with German firms attending Taiwan’s defense exhibitions and UAV cooperation emerging with Poland and Ukraine, indicating momentum [SWP, 2026]. Impact Analysis: A collapse in U.S. arms delivery reliability could undermine Taiwan’s 'porcupine strategy' of asymmetric deterrence, particularly delaying HIMARS and drone deployments critical for amphibious invasion deterrence [SWP, 2026]. For Europe, deeper ties enhance defense innovation and supply chain resilience but expose firms like Hensoldt to Chinese export bans on dual-use items, as seen in April 2026 [SWP, 2026]. A Taiwan crisis would disrupt global semiconductor supply, directly threatening European economic security, making indirect engagement a core interest. Recommended Actions: 1. Taiwan should accelerate domestic production of loitering drones and mobile missile systems, leveraging EU testing and certification support (e.g., DEKRA) to reduce U.S. dependency. 2. European states should coordinate defense-industrial cooperation through the European Defence Agency, focusing on dual-use technologies (drones, AI, secure comms) while maintaining formal adherence to the One China policy. 3. The U.S. should clarify its Taiwan policy to counter strategic ambiguity with credible, stockpile-backed commitments, especially for approved $11 billion arms package delivery timelines. 4. EU and Taiwan should co-develop China-free drone supply chains, expanding on current export growth (136,010 units to Europe in Q1 2026) to build mutual resilience [SWP, 2026]. Confidence Matrix: - U.S. policy erosion: High confidence — based on public statements, paused arms sales, and intra-administration conflict. - Taiwan’s strategic pivot: High confidence — confirmed by procurement shifts, budget allocations, and international partnerships. - European escalation risk: Medium-high confidence — evidenced by Chinese export bans, but escalation likely calibrated rather than immediate. - Effectiveness of porcupine strategy: Medium confidence — based on Ukraine analogies, but untested against PLA-scale invasion. - Sustainability of U.S. stockpiles: High confidence — supported by Pentagon ‘command of the reload’ warnings and combat expenditure data [SWP, 2026].
Published July 1, 2026