US 'committed' to defending Asia allies
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US ready for 'military action if necessary' against N Korea

The US called a session of the United Nations Security Council on Friday to discuss North Korea.

Secretary of State Rex Tillerson reiterated that "all options for responding to future provocation must remain on the table".

"Diplomatic and financial levers of power will be backed up by a willingness to counteract North Korean aggression with military action, if necessary."

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