"The North Korean regime is the cause of this problem and they must fix it ," he said on Twitter.
"The international community is shoulder to shoulder in ensuring North Korea stops its aggressive acts.
"We are working with the US and our partners in the region to bring this crisis to a diplomatic end."
US President Donald Trump today reassured Guam it was secure amid mounting regional tensions, vowing that American military forces "stand ready" to safeguard the US Pacific island territory against a belligerent North Korea.
Chinese leader Xi Jinping urged Trump to avoid rhetoric that could inflame the situation, while French President Emmanuel Macron warned against an "escalation of tensions".
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