WASHINGTON (AP) — As worrying as North Korea's nuclear advance is for America, the increasingly realistic threat of an atomic warhead striking a U.S. city might be more unnerving for South Korea and Japan.
So much so that Washington is considering new ways to flex its nuclear muscle to defend its allies, while they ponder if they'll need nukes one day.
For decades, the U.S. has defended South Korea and Japan through an extended "nuclear umbrella.
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