US, South Korea And Japan Participate In Anti-Missile Drills

The U.S., South Korea and Japan participated in joint missile-tracking exercises this week.

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The EU's trade commissioner told reporters the agreement is the biggest free trade deal the bloc has ever negotiated.

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Those trilateral drills are the first since North Korea's missile test late last month. The drills also follow a new report from North Korea watchdog group 38 North. The report alleged satellite photos showed the North was constructing a submarine capable of launching ballistic missiles.

Submarine launch ballistic missiles, or SLBMs, present a particular challenge because they're harder to detect before launch. Military personnel are using computer simulations to practice tracking North Korean submarine-launched missiles.