SEOUL, June 23 (UPI) -- North Korean leader Kim Jong Un called for accelerating the expansion of North Korea's nuclear forces, citing increasingly hostile military cooperation between Seoul and Washington and an unstable global security environment, state media reported Monday.

SEOUL, June 23 (UPI) -- North Korean leader Kim Jong Un called for accelerating the expansion of North Korea's nuclear forces, citing increasingly hostile military cooperation between Seoul and Washington and an unstable global security environment, state media reported Monday.