North Korean leader Kim Jong-Un (in white) watches the test of a new anti-aircraft guided weapon system at an undisclosed location. Pic/AFP

North Korea fired at least one short-range ballistic missile yesterday that landed in the sea off its east coast, the latest in a fast-paced series of missile tests defying world pressure and threats of more sanctions. The missile was believed to be a Scud-class ballistic missile and flew about 450 km, South Korean officials said.