N.Korea 'Poised for Massive Military Drills'

North Korea is expected to conduct massive military training with both nuclear and conventional weapons and launch a new solid-fuel intercontinental ballistic missile in March and April, the National Intelligence Service told lawmakers Tuesday.

The drills would be timed to coincide with joint South Korea-U.S. military exercises and a Seoul-Washington summit.

The NIS also warned that North Korea could try to launch a spy satellite. It speculated that the North will test-fire an ICBM at a normal angle but with a shortened range to perfect technology that would allow it eventually to hit the U.S. mainland. 

The same day, North Korean leader Kim Jong-un's sister Yo-jong warned that the North is ready to take "quick, overwhelming action" as it closely watched the "restless military moves" by South Korea and the U.S. 

The spy agency is trying to confirm an intelligence report that Kim Jong-un's first child is a son. It said the child has never been seen in public, and the NIS has so far been unable to confirm speculation that he is physically or mentally handicapped. 

Commenting on Kim's daughter Ju-ae, who has recently been paraded through the state media, the NIS said she has never attended any regular school and is being homeschooled in Pyongyang. Her hobbies are said to be horse riding, swimming and skiing. 

She rode a white horse alongside her father during a military parade marking the 75th anniversary of the army in early February.

Kim also has a third child, whose gender has not been identified yet.