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Japan has integrated Tomahawk cruise missile firing capability into its destroyer JS Chokai, marking a major step in strengthening its long-range strike power. Live-fire training is scheduled for August.

The Japan Maritime Self-Defence Force (JMSDF) has confirmed that modifications have been completed to enable the integration of RGM-109 Tomahawk cruise missiles one of its ships. “By around this summer, through live-fire drills and other tests, Chokai will attain its full operational capability,” the Japanese Ministry of Defense said in a social media post.

The warship is among the first in Japan’s fleet being prepared to launch U.S.-made Tomahawk missiles, giving it the ability to hit targets more than 1,000 kilometers away and signaling a shift in the country’s defense strategy.

Japan decided last year to acquire around 400 Tomahawk missiles. These will be deployed across eight Aegis destroyers as part of a broader plan to strengthen what is known as “stand-off” capability.

Stand-off weapons are designed to hit targets from a long distance. This allows military forces to operate from safer positions, reducing the risk of being attacked in return.

The move reflects growing concerns that Japan’s current missile defense systems may not be enough to stop all threats.

Defense Minister Shinjiro Koizumi addressed this issue in a recent briefing. He said, “To prevent missiles flying through the missile defense network and to prevent further armed attacks, it is necessary to have the ability to counterattack. Stand-off missiles can also be used for this counterattack ability.”

This statement highlights a clear change. Japan is no longer focusing only on defending its territory but is also preparing to respond if attacked.

Tomahawk Cruise Missile

Tomahawk cruise missiles are known for their long range and precision. They can travel more than 1,600 kilometers and can be launched from ships or submarines.

The versions being used by Japan have advanced features. They can change direction during flight and, in some cases, hit moving targets. This makes them highly flexible in combat situations.

The upgraded JS Chokai can carry both Block IV and Block V versions of the missile. These provide improved targeting and strike capabilities.

This upgrade is seen as an important milestone in Japan’s effort to quickly build a more modern and capable military force.

Training and Deployment Plans

The JS Chokai was sent to the United States in October 2025 for upgrades and training. It stayed at Naval Base San Diego, where its crew worked with the U.S. Third Fleet.

The ship is expected to carry out live-fire training in August. After that, it will return to its home base in Sasebo, located on Japan’s southwestern island of Kyushu, in September.

These steps are part of a wider effort to ensure that Japan’s forces are ready to use the new systems effectively.

Broader Military Buildup

Japan has been developing stand-off capabilities for several years. The concept was first introduced in 2017 and later became a key part of its security strategy in 2020.

In 2022, the country expanded these plans further. This included deploying upgraded Type 12 missiles in the southwest and introducing new high-speed gliding projectile systems across the country.

Experts say these changes show that Japan is moving toward a new defense model.

Maritime security expert Benjamin Blandin described it as a “denial and limited strike” approach. This means Japan aims to prevent attacks while also having the ability to strike back if necessary.

He explained that Japan is “operationalizing a long overdue counterstrike capability, shifting from strict homeland defense to semi-regional deterrence by being able to strike ground and naval targets at up to 1000 km.”

Despite these changes, Japanese officials insist that the new capabilities are still defensive in nature. Koizumi said the country’s military strength, including its new missile systems, represents the “minimum necessary for self-defense.”

He also stressed that these weapons would only be used if Japan is attacked. “They would only be used in the event of an armed attack from another country … and it does not pose a threat to other countries,” he said.

This reflects Japan’s long-standing policy of limiting military action to self-defense under its constitution.

Missile Supply Concerns

Some analysts have raised concerns about whether the United States can supply enough Tomahawk missiles to its allies.

Reports suggest that more than 800 missiles were used in a recent U.S. military operation against Iran. This has raised questions about stock levels and future deliveries. However, experts believe Japan’s orders are unlikely to face immediate problems.

Blandin said that while long-term conflicts could cause delays, deliveries to Japan will likely continue as planned. “No major impact expected in regards to Iran, as deliveries will not take place all at once but probably over the course of a few years,” he said.

He also noted that the United States is likely to prioritize Japan because of its importance as an ally in the Indo-Pacific region.

Increased Production Efforts

To address supply concerns, U.S. defense company RTX announced new agreements with the Department of Defense earlier this year.

The goal is to increase production of Tomahawk missiles, including both land-attack and maritime strike versions.

The company said it expects to produce more than 1,000 missiles per year once the new measures are in place. This could help ensure that both U.S. forces and allied countries like Japan receive the weapons they need.

The upgrade of the JS Chokai shows how quickly Japan is changing its defense posture. For decades, the country focused almost entirely on protecting its own territory. Now, it is building the ability to respond more actively to threats.

This shift is likely to have wider effects across the region, as other countries watch closely and adjust their own strategies.

As Japan continues to strengthen its military capabilities, its role in regional security is expected to grow, especially in an increasingly uncertain global environment.