North Korea said Friday it had tested a purported underwater nuclear attack drone in response to a combined naval exercise between South Korea and the United States and Japan this week, as it continues to blame its rivals for raising tension in the region. The alleged drone test came days after North Korean leader Kim Jong Un declared he would scrap his country's long-standing goal of a peaceful unification with South Korea and that his country would rewrite its constitution to define South Korea as its most hostile foreign adversary.

Tension on the Korean Peninsula is at its highest point in years, with Kim accelerating weapons demonstrations and threatening nuclear conflict and the U.S. and its Asian allies responding by strengthening their combined military exercises.

The test was not of a nuclear device but rather of an "underwater self-explosive drone," according to Shin Jong-woo, a military expert at the Seoul-based Korea Defense and Security Forum. Shin called it a "navigation test for their battery-powered underwater suicide drone," adding that North Korea was testing how the drone would perform over long distances and long periods of time.

Shin noted that North Korea had tested the Haeil-2 Unmanned Underwater Nuclear Attack Boat between April 4 and 7 of last year. CBS News senior foreign correspondent says the weapons is something like a cross between a rocket and an unmanned submarine — but capable, the North Korean regime says, of carrying a nuclear warhead.

The test in the spring of 2023, according to North Korean state media, saw the drone cruise about 600 miles underwater over the course of three days before test detonating a non-nuclear warhead at sea.

North Korea's alleged nuclear attack drone is among a broad range of systems demonstrated in recent years as Kim expands his arsenal of nuclear-capable weapons. South Korea's military has insisted the North has exaggerated the capabilities of the drone, which is supposedly designed to carry out strikes on enemy vessels and ports.

The North's military said it conducted the test in the country's eastern waters in response to the U.S., South Korean, and Japanese naval drills, which wrapped up its three-day run Wednesday in waters south of Jeju island.

"Our army's underwater nuke-based countering posture is being further rounded off and its various maritime and underwater responsive actions will continue to deter the hostile military maneuvers of the navies of the U.S. and its allies," the North's Defense Ministry said in a statement.

"We strongly denounce the U.S. and its followers for their reckless acts of seriously threatening the security of the DPRK from the outset of the year and sternly warn them of the catastrophic consequences to be entailed by them."


Images broadcast on North Korean state TV show what it claimed to be a test of the country's Haeil-2 nuclear-capable underwater attack drone, said to have been carried out in early April, 2023. KRT/REUTERS

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