North Korean bomb prompts condemnation

North Korea's biggest nuclear test to date was condemned around the world on Sunday, with several leaders calling for new sanctions and U.S. President Donald Trump saying "appeasement" would not work.

The explosion of what North Korea said was an advanced hydrogen bomb came just days after it fired a missile over Japan. Trump, who said after last week's missile launch that talking to Pyongyang "is not the answer", tweeted that Sunday's test showed North Korea's "words and actions continue to be very hostile and dangerous to the United States".

U.S. Treasury Secretary Steve Mnuchin said he would put together new sanctions to potentially cut off all North Korea's global trade. German Chancellor Angela Merkel and French President Emmanuel Macron said they planned to tighten European Union sanctions."This latest provocation by the ruler in Pyongyang has reached a new dimension," the German government said in a statement after Merkel and Macron discussed the issue by phone.

Britain's foreign minister Boris Johnson said: "They (North Korea) seem to be moving closer towards a hydrogen bomb which, if fitted to a successful missile, would unquestionably present a new order of threat," adding that there were no palatable military solutions.

British Prime Minister Theresa May said the U.N. Security Council should urgently look at new measures.

Russia struck a cautious tone. "In the emerging conditions it is absolutely essential to keep cool, refrain from any actions that could lead to a further escalation of tensions," Russia's foreign ministry said, adding that North Korea risked "serious consequences".

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