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Japan, U.S., South Korea conduct anti-sub drills with eye on North Korea

Pyongyang hints at nuclear retaliation in denouncing joint exercises

The U.S. Navy's nuclear-powered aircraft carrier USS Nimitz arrives at a port in the South Korean city of Busan in March.   © Kyodo

JEJU ISLAND, South Korea -- Naval forces from South Korea, Japan and the U.S. began joint drills off Jeju Island on Monday, the South Korean defense ministry said, simulating a military response against North Korean submarines.

The trilateral drills involve deploying unmanned underwater vehicles as stand-ins for North Korean submarines. The three nations look to improve capabilities for sharing intelligence and repelling subs.

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