North Korea Tests First Submarine-launched Cruise Missile in Nearly 3 Years

North Korea tested two submarine-launched cruise missiles, which it described as strategic weapons. The firing took place in the Sea of Japan on Wednesday. This was the country’s first publicly disclosed SLCM test firing in nearly three years.

The Missile Administration conducted the launch, according to the Korean Central News Agency. State media reported that the test involved two types of submarine-launched strategic cruise missiles. The article does not identify the submarine, its exact launch position, or the missiles’ flight distances.

The test was meant to check the readiness of underwater combat systems. It also aimed to improve Navy crews’ ability to carry out strategic missions. North Korea said the exercise demonstrated the reliability, trustworthiness, and deterrent ability of its weapons, although the article provides no independent assessment of those claims.

A submarine-launched cruise missile is a guided weapon that a submarine launches against a land or maritime target. Unlike a ballistic missile, it uses an onboard engine for much of its flight. It can steer through the atmosphere and follow a planned route.

A submarine may fire an SLCM through a torpedo tube or a dedicated vertical launch tube. After leaving the water, the missile’s engine starts, and its guidance system directs it toward the target. Some designs fly low to reduce exposure to radar. The exact launch method depends on the submarine and missile model.

The submarine itself provides the main advantage: concealment before launch. An SLCM can therefore add a hidden strike option to a navy’s forces. North Korea’s reported test examined the readiness of underwater combat systems and its Navy’s ability to perform strategic missions.

SLCM range varies widely by design, payload, flight path, and fuel. Many modern systems travel several hundred kilometers to more than 1,000 kilometers. Some longer-range models can reach roughly 2,000 kilometers or beyond. There is no single standard range for every SLCM.

Range creates a large potential threat zone around the launch area. A missile able to travel 1,000 kilometers can theoretically reach locations across a circle with a 1,000-kilometer radius, covering millions of square kilometers. Mountains, coastlines, routing, defenses, and target availability reduce the practical area.

North Korea’s article does not give a range for the tested missiles. It reports only that two missiles were fired in the Sea of Japan. Their stated purpose was to test underwater combat readiness and strengthen the Navy’s performance of strategic missions, not to disclose a measured distance.

Submarine launch makes detection harder because the platform can remain underwater and move quietly before firing. It does not need to launch from a known land base. An adversary may therefore have less time to identify the threat and determine where the attack began.

The key mechanism is uncertainty. Defenders must search a large area of ocean for the submarine while also tracking the missile after launch. The missile may fly at low altitude and follow a route that complicates radar detection. Destroying the missile is difficult, but finding the submarine before launch can be harder still.

This advantage is why submarine weapons are associated with survivable deterrence. North Korea’s test focused on the “mobilized posture” of underwater combat systems and the Navy’s strategic missions. The article does not establish how difficult these particular missiles or submarines would be to detect in practice.

In this article, “strategic” has a specific meaning in North Korean terminology. North Korea uses the word to describe nuclear weapons capability. Calling the missiles strategic therefore places them in the country’s nuclear-related military category rather than presenting them as ordinary battlefield weapons.

The wording matters because a cruise missile can potentially carry different payloads, including conventional or nuclear warheads. The article identifies the tested weapons as submarine-launched strategic cruise missiles, but it does not state that a nuclear warhead was fitted during the test. The label signals intended capability, not proof of the payload used.

North Korea said the test demonstrated the reliability and deterrent ability of its weapons. A submarine-based missile with a possible nuclear role could strengthen the country’s threat of retaliation. Still, the available report does not establish the missile’s nuclear readiness, range, accuracy, or operational status.

The timing makes the event significant. North Korea had not publicly disclosed an SLCM test firing for nearly three years. Renewing that public disclosure draws attention to the Navy, underwater weapons, and the country’s broader strategic capabilities.

The reported test also had a practical training purpose. North Korea’s Missile Administration said it examined the current readiness of underwater combat systems. It was intended to help the Navy become more skilled at performing strategic missions. The exercise involved two missile types, suggesting attention to more than one underwater cruise-missile capability.

The launch also served as military signaling. North Korea said it demonstrated reliability, trustworthiness, and deterrent ability. Those are official claims, not independent verification. The article does not say whether the test changes the missiles’ operational status, but renewed testing could indicate continued development and future attention to submarine-based weapons.

A cruise missile is an engine-powered, guided aircraft-like weapon that usually flies through the atmosphere toward its target. A ballistic missile uses powerful early acceleration, then follows a largely arcing trajectory before descending. The two systems therefore differ in flight path, speed, altitude, and guidance.

Their different designs create different military options. Cruise missiles can maneuver and fly low, which may make them difficult for radar to detect. Ballistic missiles can travel very long distances and arrive at extremely high speeds. Both can be launched from land, ships, aircraft, or submarines, depending on the model and launcher.

Countries use both to complicate an opponent’s defenses and cover different missions. A cruise missile may offer precise, route-changing attacks, while a ballistic missile may provide speed and reach. North Korea’s reported test concerned submarine-launched cruise missiles, showing its interest in an underwater version of one part of this broader weapons mix.