Kerry says North Korea's leader reckless, ruthless

US Secretary of State John Kerry described North Korean leader Kim Jong Un as reckless and insecure after the execution of his powerful uncle, according to an ABC News interview.

The execution of Jan Song Thaek, who was considered the second most powerful man in the secretive country, showed why the world must make a united stand against North Korea's nuclear weapons program, Kerry said in the interview taped for Sunday broadcast on ABC's "This Week" program. (Reuters)