On the heels of escalating tensions in the Middle East, the United States finds itself navigating a complex web of military commitments and logistical challenges, with ripple effects reaching as far as Japan’s defense plans. This week, warnings from Iranian officials and subsequent U.S. strategic movements have not only heightened anxieties in the Persian Gulf but have also led to unexpected complications for America’s allies, particularly in the realm of advanced weapon deliveries.
On April 15, 2026, Mohsen Rezaei, a senior military advisor to Iran’s Supreme Leader Mojtaba Khamenei, issued a stark warning on Iranian state television. According to The Washington Post and corroborated by Hankyung, Rezaei declared, “If the United States tries to control the Strait of Hormuz, their warships will be sunk by our first missile attack.” He continued, “They are certainly exposed to our missiles, and we can destroy them.” Rezaei’s remarks were pointed, even taunting, as he questioned the legitimacy of America’s role in the region: “Trump wants to become the policeman of the Strait of Hormuz. Is this really your role? Is this what a powerful military like the United States should be doing?”
Rezaei didn’t stop at threats to U.S. naval assets. Addressing the possibility of a U.S.-led ground operation in Iran, he suggested that such an incursion could result in the capture of thousands of hostages, with Iran demanding a ransom of $1 billion per hostage. While the rhetoric may be bluster, the underlying message was clear: Iran is prepared to retaliate forcefully against any perceived American aggression in the strategic waterway.
In response to the mounting hostilities and the collapse of ceasefire negotiations, the United States has dramatically ramped up its military presence in the region. According to The Washington Post, the U.S. is currently deploying approximately 6,000 troops and three aircraft carriers—the Abraham Lincoln, Gerald R. Ford, and George H.W. Bush—to the Middle East. By the end of April, an additional 4,200 personnel from the Boxer Amphibious Ready Group and the 11th Marine Expeditionary Unit are expected to arrive, further bolstering America’s regional footprint. Behind the scenes, contingency plans are being drawn up for possible ground operations in Iran should diplomatic efforts continue to falter.
But these moves are not without consequence. The intensity of the Iran conflict has placed enormous strain on America’s arsenal, particularly its stockpile of Tomahawk cruise missiles. Over a span of just four weeks, more than 850 Tomahawk missiles have reportedly been used in operations against Iranian targets, according to The Washington Post. The Pentagon does not disclose exact inventory numbers, but with only a few hundred Tomahawks produced annually, the rapid depletion has created a bottleneck in the supply chain.
This shortage is being felt acutely by Japan, one of America’s closest allies in the Asia-Pacific. On April 16, Japanese media outlets including Asahi Shimbun and Yonhap News reported that the U.S. had formally notified Tokyo of possible delays in the delivery of Tomahawk cruise missiles. The cause? The heavy use of the missiles in the Iran conflict has drained available stock, leaving the United States unable to fulfill its original delivery timeline.
U.S. Defense Secretary Pete Hegseth personally conveyed the news to Japan’s Defense Minister Shinjiro Koizumi during a phone call in mid-March. While Koizumi expressed his understanding of the U.S. predicament, he urged Hegseth to ensure that Japan’s contracted deliveries would proceed as smoothly as possible, especially as Japan moves to strengthen its own counterstrike capabilities.
Japan’s ambitions to bolster its defense have been clear for some time. In January 2024, Tokyo signed a contract with Washington to acquire 400 Tomahawk missiles by the end of fiscal year 2027 (April 2027 to March 2028), at a cost of approximately 254 billion yen (about 2.3 trillion KRW). The original plan was to purchase the latest Block 5 variant, but recognizing the urgency of fielding a credible counterstrike option, Japan opted to substitute half of the order with older Block 4 missiles, expediting delivery to begin as early as fiscal year 2025 (April 2025 to March 2026).
By March 2026, Japan’s Ministry of Defense had already begun receiving some Tomahawk deliveries and had completed modifications and crew training on the Aegis destroyer Chokai to enable Tomahawk deployment. Plans were in place for firing tests in U.S. waters during the summer, with full operational deployment scheduled for September 2026. However, the extent of the delays remains uncertain. Japanese defense officials have indicated that while the missiles needed for initial firing tests will likely be prioritized, the rest of the deliveries are now in limbo. “We don’t know how much the rest of the delivery will be delayed,” one Ministry of Defense official told Asahi Shimbun.
The delay poses a significant challenge for Japan’s defense posture. The country’s plans to acquire up to 400 Tomahawk missiles were designed to bridge a capability gap until Japan’s own long-range missiles can be fielded. As Yonhap News noted, the Tomahawks are viewed as a core element of Japan’s nascent counterstrike capability, intended to deter potential adversaries by threatening the ability to strike enemy missile launch sites preemptively.
For now, the Japanese Maritime Self-Defense Force is pressing ahead with preparations. The Chokai has been retrofitted, and its crew has completed training. The Ministry of Defense remains hopeful that at least the missiles required for the upcoming firing tests will arrive on schedule, allowing for a symbolic if not fully operational deployment by September. Yet, with the U.S. military’s own needs taking precedence and production capacity limited, the timeline for the remainder of Japan’s order is anyone’s guess.
These developments underscore the interconnectedness of global security in 2026. A crisis in the Persian Gulf can have immediate and tangible effects on defense procurement and military readiness thousands of miles away. As the U.S. juggles its commitments in the Middle East and the Indo-Pacific, its allies are left to navigate the uncertainties of a shared but strained supply chain.
With the Strait of Hormuz simmering and the world watching, the next moves by Washington, Tehran, and Tokyo will be closely scrutinized—not just for their immediate impact, but for what they reveal about the shifting balance of power and the unforeseen consequences of modern warfare.