By Joyce Lee and Atsuko Aoyama SEOUL (Reuters) -North Korea fired three ballistic missiles toward the sea east of the Korean Peninsula on Saturday, the South Korean military said. The launches were the latest in an unprecedented number of missile tests conducted by North Korea this year, as Pyongyang presses on with weapons development amid speculation it could test a nuclear weapon for a seventh time. The three short-range ballistic missiles were fired from around 8 am local time (2300 GMT) from North Hwanghae Province, south of the capital Pyongyang, South Korea’s Joint Chiefs of Staff said….