Steps to expand missile defenses will cost $ 1 billion . Defense Secretary Barack Obama says One more missile interceptors will be deployed by last week . NEW : N. Korea rocket launch , nuke test , mobile missile and threats prompt action . N. Korea to work with N. Korea to increase radar capability to improve early warning , tracking .
Steps to expand missile defenses will cost $ 1 billion . Defense Secretary Hagel says 14 more missile interceptors will be deployed by 2017 . NEW : N. Korea rocket launch , nuke test , mobile missile and threats prompt action . U.S. to work with Japan to increase radar capability to improve early warning , tracking .