Kim Jong Un Oversees Major Military Milestones: Completed Nuclear Submarine Hull and New SAM Test Heighten Regional Tensions
Pyongyang, December 25, 2025 – In a series of provocative announcements timed for the holiday season, North Korean state media revealed that leader Kim Jong Un personally inspected the completed hull of an ambitious 8,700-ton nuclear-powered submarine and oversaw the successful test-firing of a new high-altitude, long-range surface-to-air missile (SAM). These developments, showcased through official photographs and reports from the Korean Central News Agency (KCNA), signal Pyongyang’s accelerating push toward advanced naval nuclear capabilities and enhanced air defenses, amid escalating rhetoric against South Korea and the United States.
The dual revelations underscore Kim’s determination to modernize North Korea’s military, particularly its navy, as a counter to perceived threats from Seoul’s own nuclear submarine ambitions and recent U.S. naval deployments in the region.
The Nuclear-Powered Submarine: A Step Toward Strategic Deterrence
State media photos depicted Kim Jong Un, accompanied by his daughter Kim Ju Ae—often seen as a potential successor—at an undisclosed shipyard, examining a massive burgundy-colored vessel coated in anti-corrosion paint inside a large assembly hall. KCNA described the submarine as an “8,700-ton-class nuclear-propelled strategic guided missile submarine,” emphasizing its role in the “modernization and nuclear armament” of the navy.
Kim hailed the project’s progress as an “epoch-making crucial change” that would bolster North Korea’s nuclear war deterrent. The hull’s apparent completion suggests significant internal advancements, as submarines are typically constructed from the inside out. Experts note that key components, such as the nuclear reactor and propulsion systems, are likely already installed or nearing integration.
This submarine, first prioritized by Kim during the 2021 Workers’ Party congress, is designed to carry ballistic missiles, cruise missiles, and torpedoes—potentially with nuclear warheads. If operational, it would enable stealthy, extended patrols and underwater launches, complicating detection and response for adversaries. Analysts estimate sea trials could begin within months, marking a leap from North Korea’s existing diesel-electric fleet, including submarine-launched ballistic missile (SLBM) capabilities demonstrated in recent years.
Kim directly linked the project to external pressures, condemning South Korea’s plans—backed by the United States—to develop its own nuclear-powered submarines as an “offensive act” threatening North Korea’s security. He vowed to accelerate naval nuclear weaponization in response. Pyongyang also criticized the recent port call by the U.S. Navy’s Los Angeles-class nuclear-powered attack submarine USS Greeneville in Busan, calling it a “grave act” escalating tensions.
New Surface-to-Air Missile Test: Enhancing Defensive Layers
On the same day, KCNA reported that Kim oversaw the inaugural test of a new long-range, high-altitude SAM on December 24. Conducted near the east coast, the missile accurately struck mock targets at an altitude of approximately 200 kilometers (124 miles), demonstrating advanced capabilities in intercepting high-flying threats.
South Korea’s military confirmed detecting the launches, describing them as surface-to-air missiles fired into the East Sea. This new system aims to bolster North Korea’s air defense network, potentially countering advanced aircraft, cruise missiles, or ballistic threats at extended ranges and altitudes.
The test aligns with Pyongyang’s broader efforts to layer defenses around its nuclear arsenal, complementing offensive developments like hypersonic missiles and multiple-warhead ICBMs showcased earlier in 2025.
Broader Context: Escalating Tensions on the Korean Peninsula
These announcements come amid heightened frictions. North Korea has deepened ties with Russia, supplying troops and munitions for the Ukraine conflict in exchange for potential technological aid—some speculate including submarine reactor expertise. Meanwhile, South Korea advances its conventional and nuclear-propulsion submarine programs under U.S. nuclear umbrella protection, without plans for nuclear arming.
Experts warn that a functional North Korean nuclear-powered submarine (SSBN or SSGN) would alter the regional balance, enabling second-strike capabilities and raising proliferation risks. Combined with improved SAMs, it complicates U.S. and allied operations, including potential preemptive strikes.
International reactions have been swift: The U.S. and South Korea condemned the developments as provocative, while calling for denuclearization talks—repeatedly rebuffed by Pyongyang. Japan and others expressed concern over destabilization in Northeast Asia.
Kim’s public appearances with his daughter also fuel speculation about succession planning, as she accompanies him to high-profile military events.
Implications for Regional Security
As 2025 draws to a close, North Korea’s military advancements reflect Kim’s unyielding focus on self-reliance and deterrence amid sanctions and isolation. The submarine’s near-readiness and new SAM could embolden more aggressive posturing, testing alliances like the U.S.-South Korea-Japan trilateral framework.
Diplomacy remains stalled since the 2019 Hanoi summit collapse, with Kim prioritizing “war deterrence” over engagement. Analysts predict further tests in 2026, potentially including SLBM launches from the new platform.
In a year marked by global conflicts, North Korea’s Christmas revelations serve as a stark reminder of persistent nuclear risks on the Korean Peninsula.
This article is compiled from reports by KCNA, international media, and expert analyses.
By: Juba Global News Network | JubaGlobal.com
