North Korea urges nuclear build-up on anniversary

North Korea's state media marked the nation's founding anniversary Saturday with calls for a nuclear arms buildup, in defiance of mounting international sanctions.South Korea's military said it was keeping close tabs on the North amid speculation it could stage a missile launch or another nuclear test to mark the 1948 establishment of the Democratic People’s Republic of Korea.North Korea conducted its fifth nuclear test on September 9 last year, and then carried out a sixth a week ago, say