Never-before-seen photos of Kim Jong-un show the North Korean leader as a young boy.

In one photo, he salutes in military garb. In another, he is smiling into the camera.

The photos were projected on a screen during a concert and televised on the state-run station Korean Central Television, reports The Telegraph.

Kim's face as a child contrasts with the sharp warning from South Korea that their neighbors to the north could be preparing an atomic test.

Seoul defense ministry spokesman Kim Min-seok said Tuesday that North Korea has threatened something "unimaginable" for its enemies.

President Obama is visiting South Korea on April 25.

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