What does China’s submarine missile test mean for its nuclear triad expansion?

China’s rare launch of a ballistic missile from a nuclear-powered submarine into the deep Pacific sent a strategic signal to the United States and regional neighbours, particularly Japan, amid concerns about Beijing’s military expansion. Monday’s test is also likely to reinforce calls in Washington and among US allies for greater defence investment and closer security coordination as regional tensions continue to rise, according to analysts. What happened during China’s submarine-launched...