SEOUL, South Korea (AP) — For days North Korean officials have raged over U.S.-South Korean military drills, promising a violent response. That response came this week, when the North fired nearly 30 missiles in the span of two days, including a short-range weapon that splashed down near the South Korean sea border and an intercontinental ballistic missile that forced Japan to issue an evacuation alert and halt trains.

It was a significant escalation in a year that has already seen the most North Korean missile test launches ever, and it raises an important question: How much further will they go?

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