Two North Korean fighter jets have crashed in recent months during training, South Korea's Defense Ministry said Tuesday. A North Korean MiG-21 fighter went down in March because of a lack of maintenance and another North Korean fighter jet crashed during training in February, said a ministry official. He spoke on condition of anonymity as he was not authorized to speak to the media. He had no other details on either crash, including the exact dates and the fate of the crew. Both crashes occurred during ongoing tensions on the Korean peninsula. North Korea claimed a rocket it launched over Japan on Sunday put a satellite into orbit, though the United States said the payload fell into the Pacific Ocean.