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 . It is part of a package of steps expected to cost $ 1 billion , officials said . 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 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 .