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The Chinese military tested a submarine-launched ballistic missile on Monday, emphasizing its ability to threaten the United States with the world’s most lethal weapons. Flying more than 4,300 miles, the missile soared high past Taiwan, Japan, and the U.S. territory of Guam, a key Pacific Ocean military bastion. Its dummy warhead, designed to simulate a nuclear warhead, then splashed down in waters north of the Solomon Islands.