North Korea has confirmed that it will launch its first spy satellite in June, with a senior official citing a need to monitor the U.S. and its allies "in real time" as they hold a series of ongoing joint military exercises, state-run media said Tuesday.

Japan on Monday ordered the Self-Defense Forces to prepare to shoot down a North Korean ballistic missile or rocket that threatens Japanese territory, the Defense Ministry said, after Pyongyang notified Tokyo of plans to launch the satellite before June 11.