A deepening conflict with Iran is forcing a significant drawdown of US strategic munitions, raising questions about America's ability to maintain deterrence against China in the Indo-Pacific. The rapid consumption of high-end missile interceptors, with some estimates putting the use of THAAD systems at nearly 50 percent of the total US stockpile, has ignited concerns among allies and within the Pentagon over resource allocation between two critical theaters.
"Fears of Chinese opportunistic aggression stemming from the Iran war are understandable but miss the mark," Michael Poznansky and Michael O’Hanlon of the Brookings Institution wrote in the Wall Street Journal. They argue that Beijing's decision-making regarding Taiwan is influenced more by long-term factors than by short-term US readiness, and that America's demonstrated willingness to use force could give China pause.
The operational tempo has been intense. More than 200 Terminal High Altitude Area Defense (THAAD) interceptors have reportedly been fired, alongside significant numbers of SM-3 and SM-6 missiles from naval vessels. The USS Abraham Lincoln carrier strike group was also redirected from the South China Sea to the Middle East, a move that did not go unnoticed by observers in Asia. These missile defense systems form the core of the US security architecture for allies like South Korea and Japan.
At stake is the long-held US doctrine of being able to fight and win on multiple fronts. The current conflict is consuming strategic reserves at a rate far faster than they can be replenished, forcing a difficult trade-off between containing Iran today and deterring China tomorrow. This depletion has already prompted unease in Seoul and Tokyo, who rely on the US defense umbrella to counter threats from North Korea and China.
A Doctrine Under Duress
The debate centers on two contrasting views of Chinese strategic calculus. The first, articulated by analysts like Poznansky and O'Hanlon, posits that Chinese President Xi Jinping is playing a long game. In this view, a decision to invade Taiwan would hinge on factors like China's relative economic and military power, the political climate in Taiwan, and the perceived readiness of the People's Liberation Army—not a temporary window of opportunity created by a US war elsewhere.
The opposing view is more pragmatic, focusing on inventory and logistics. It argues that while China may prefer to wait, the visible depletion of America's high-end munitions presents a "use-it-or-lose-it" scenario for US deterrence. With production lines for sophisticated missiles unable to keep pace with wartime consumption, every interceptor used in the Middle East is one less available for a potential conflict over Taiwan. This reality has reportedly unsettled officials in South Korea and Japan, who now question the durability of US security commitments.
Hormuz Adds Economic Pressure
Compounding the military strain is a volatile economic situation centered on the Strait of Hormuz, the maritime chokepoint through which roughly 20 percent of the world's oil and LNG supplies pass. Iranian rhetoric about potential transit restrictions or fees has added a significant risk premium to global energy markets. Secretary of State Marco Rubio issued a stark warning that any such move would make a diplomatic solution "impossible," with Washington considering action at the UN Security Council.
For President Trump, the economic risks are a major political liability, particularly with midterm elections approaching. The administration is acutely aware that rising gasoline prices, driven by instability in the Persian Gulf, could damage their standing with voters more than any foreign policy success could bolster it. This economic pressure helps explain the administration's oscillation between threats of escalation and calls for a swift end to the conflict.
This article is for informational purposes only and does not constitute investment advice.
