North Korea's biggest nuclear test to date has been condemned around the world.
WORLD REACTION TO NORTH KOREA'S BIGGEST NUCLEAR TEST TO DATE:
President Emmanuel Macron: "The international community must treat this new provocation with the utmost firmness, in order to bring North Korea to come back unconditionally to the path of dialogue and to proceed to the complete, verifiable and irreversible dismantling of its nuclear and ballistic program," he said in a statement.
China, the only North Korean ally that is a permanent member of the UN Security Council, urged its neighbour to stop "wrong" actions that worsen the situation. It said it would fully enforce UN resolutions on the country.
The Russian foreign ministry: "In the emerging conditions it is absolutely essential to keep cool, refrain from any actions that could lead to a further escalation of tensions," it said on its website, adding that North Korea risked "serious consequences".
Japanese Prime Minister Shinzo Abe said North Korea's "nuclear and missile development programs pose a new level of a grave and immediate threat" and "seriously undermines the peace and security of the region."
South Korean President Moon Jae-in said North Korea's sixth nuclear test should be met with the "strongest possible" response, including new United Nations Security Council sanctions to "completely isolate" the country.
Australia has condemned North Korea's "flagrant defiance" of UN Security Council resolutions and urged the world body to take further action against the "dangerous pariah regime."
"We call for the UN Security Council to urgently consider further strong measures that would place pressure on North Korea to change course," Prime Minister Malcolm Turnbull said in a joint statement with Foreign Minister Julie Bishop.
Australia called for all countries, especially the five UN veto powers "to apply the maximum possible pressure to this dangerous pariah regime," according to the statement.
The International Atomic Energy Agency, which has no access to North Korea, called the nuclear test, Pyongyang's test is "an extremely regrettable act" that is "in complete disregard of the repeated demands of the international community."