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North Korean Submarine Missile Threat Prompts U.S.-Led Military Drills

HONG KONG — Amid fears that North Korea is rapidly developing its submarine-launched ballistic missile technology, the United States, Japan and South Korea are teaming up for a drill to track such hard-to-detect missiles, military officials said Monday.

The drill is taking place over two days in waters between Japan and the Korean Peninsula, said South Korea’s Joint Chiefs of Staff, and will involve destroyers from the three nations doing computer-simulated training to track submarine missile launchings by North Korea.

The drills come in the wake of news reports that North Korea is making progress developing submarine-launched ballistic missiles, or SLBMs.