North Korea says it tested new underwater nuclear attack 'drone'

North Korea claimed Friday it had tested an underwater nuclear attack drone able to unleash a "radioactive tsunami", as it blamed recent US-South Korea exercises for a deteriorating regional security situation.

Pyongyang carried out drills in response this week, including testing of the new underwater nuclear delivery system.

This nuclear underwater attack drone can be deployed at any coast and port or towed by a surface ship for operation.

The weapon's mission is to stealthily infiltrate into operational waters and make a super-scale radioactive tsunami ... to destroy naval striker groups and major operational ports of the enemy.

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