His comments come after a national-security briefing with President Donald Trump about North Korea's latest and potentially most worrisome nuclear test.
Mattis promises North Korea 'massive response' if allies threatened
Bộ trưởng quốc phòng Mỹ James Mattis Source: AAP
United States defence secretary James Mattis has promised what he calls a "massive military response" to any threat from North Korea against the United States or its allies.
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