(REUTERS) North Korea conducted a big live-fire exercise on Tuesday to mark the foundation of its military as a U.S. submarine docked in South Korea in a show of force amid growing concern over the North’s nuclear and missile programs.

The port call by the USS Michigan came as a U.S. aircraft carrier strike group steamed toward Korean waters and as top envoys for North Korea policy from South Korea, Japan and the United States met in Tokyo.

Fears have risen in recent weeks that North Korea would conduct another nuclear test or long-range missile launch in defiance of U.N. sanctions, perhaps on the Tuesday anniversary of the founding of its military.

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