China tests nuclear-capable submarine missile in South Pacific

China tests nuclear-capable submarine missile in South Pacific

China launched a nuclear-capable ballistic missile into the South Pacific Ocean on Monday, July 6, 2026. The test, conducted by the People’s Liberation Army (PLA) Navy from a nuclear-powered submarine, utilized a training warhead and landed near the Solomon Islands.

Beijing described the event as part of routine annual training, according to a statement from the Ministry of Defense.

Strategic Signal and the Nuclear Triad

Experts suggest the test serves as a demonstration of China's "second-strike capability," which allows the military to retaliate even if attacked first. According to Dominic Meagher, a research fellow at the Crawford School of Public Policy in Australia, this is possible because firing capabilities are distributed across land and ocean.

The operation underscores the sea-based leg of China's nuclear triad—the ability to launch nuclear weapons from land, air, and sea. Nathan Beauchamp-Mustafaga, a senior policy researcher at RAND, said the test suggests Beijing is interested in proving its emerging nuclear triad is credible. Jacob Stokes of the Center for a New American Security noted a clear progression in China's forces, following a land-based ICBM test in September 2024, and predicted an air-launched ballistic missile could be next.

Reports on the specific hardware vary. The secretary-general of Taiwan’s National Security Council identified the weapon as a JL-2, an older submarine-launched missile with a range of approximately 7,000 kilometers (4,350 miles) that was fired from the surface. Conversely, Chinese state media featured experts suggesting it was a JL-3, which Shao Yonglin told CCTV can strike targets on the east side of the Pacific from the west side.

Regional Friction and Treaty Violations

The missile landed within the South Pacific Nuclear Free Zone, established by the 1986 Treaty of Rarotonga. While China ratified protocols in 1987 prohibiting nuclear weapons testing in the zone, the launch drew sharp criticism from regional leaders.

Solomon Islands Prime Minister Matthew Wale said of the act,

"China is a good friend of Solomon Islands, but this is not something a friend does. This is not … good in our region."

Matthew Wale, Prime Minister of Solomon Islands, via AP

Australia's Prime Minister Anthony Albanese decried the launch as a provocative act by China which does destabilize the region. He expressed concern that the test took place with very little notice.

The launch coincided with a significant diplomatic event: the signing of the Ocean of Peace Alliance (the Veitacini Treaty), a mutual defense treaty between Australia and Fiji. This makes Fiji Australia's fourth ally. Analysis from The Diplomat suggests Beijing timed the missile launch to warn Pacific Island nations against deepening security ties with Australia.

Lack of Transparency and Diplomatic Fallout

China claimed it informed relevant countries in advance, but several governments disputed the timing. Australia and Japan also cited a lack of transparency.

While Beijing notified Australia, New Zealand, Japan, and Papua New Guinea, it remains unclear if the United States was notified. The State Department saying Beijing's rapid and opaque nuclear weapons buildup is of great concern.

K. Tristan Tang, a fellow at the National Bureau of Asian Research, noted that China is not a member of the Hague Code of Conduct, which expects states to provide at least 24 hours of notice for ballistic missile use.

Military Buildup

The test follows a period of rapid naval expansion. According to the International Institute for Strategic Studies, China has built nuclear-powered submarines faster than the U.S. Over the last five years.

China operates six nuclear-powered ballistic missile submarines that can carry up to 12 missiles each, according to a 2024 Pentagon report to the US Congress.