What to know about China’s rare ballistic missile test and why it raises concerns

China's navy test-launched a long-range ballistic missile from a nuclear-powered submarine, raising concerns about its nuclear deterrence strategy and drawing protests from the U.S., New Zealand, and other Asian-Pacific nations. Experts speculate the missile could be a JL-3 with a range exceeding 10,000 kilometers, though China stated it was a routine training exercise complying with international law. The launch into the South Pacific Nuclear Free Zone sparked accusations of violating treaty intentions.