UPDATE: PYONGYANG, North Korea (AP) -- North Korean Foreign Ministry warns of unspecified 'second and third measures' after nuke test.
(CNN) -- Reaction to North Korea's nuclear test -- its third since 2006 -- poured in Tuesday from around the world:
Barack Obama, U.S. president:
"This is a highly provocative act that ... undermines regional stability, violates North Korea's obligations under numerous United Nations Security Council resolutions, contravenes its commitments under the September 19, 2005 Joint Statement of the Six-Party Talks, and increases the risk of proliferation.
North Korea's nuclear weapons and ballistic missile programs constitute a threat to U.S. national security and to international peace and security. The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region."
"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies."
China's Ministry of Foreign Affairs:
The Chinese government "resolutely opposes" North Korea's nuclear test, the Ministry of Foreign Affairs said in a statement.
"Holding up peace and stability in Northeast Asia is China's resolute position," the statement said. "We strongly urge (North Korea) to abide by (its) promise to denuclearize and take no further action that will worsen the situation."
Park Geun-hye, South Korean president-elect:
"Despite the strong warning from the international community and South Korea, North Korea has conducted its third nuclear test, and we strongly condemn it."
"The North Korean nuclear test is a serious threat to the peace of the Korean peninsula and the world, and it has hampered the credibility between the South and North."
Shinzo Abe, Japanese prime minister:
"North Korea's nuclear testing is a grave threat to the safety of Japan and a serious challenge against international disarmament framework based on non nuclear proliferation treaty. We can never tolerate as it significantly compromise the peace and safety of North East Asia and the international society."
"Japan firmly protests and sternly condemns the nuclear testing."
Statement from the office of Ban Ki-moon, U.N. secretary-general:
"The Secretary-General condemns the underground nuclear weapon test conducted by the Democratic People's Republic of Korea (DPRK) today. It is a clear and grave violation of the relevant Security Council resolutions.
It is deplorable that Pyongyang defied the strong and unequivocal call from the international community to refrain from any further provocative measures. The Secretary-General had repeatedly called on the new leadership in Pyongyang to address international concerns and start building confidence with neighbouring countries and the international community.
The Secretary-General is gravely concerned about the negative impact of this deeply destabilizing act on regional stability as well as the global efforts for nuclear non-proliferation. He once again urges the DPRK to reverse course and work towards de-nuclearization of the Korean peninsula.
The Secretary-General is confident that the Security Council will remain united and take appropriate action. In the meantime, the Secretary-General remains in close contact with all concerned parties and stands ready to assist their efforts."
Yukiya Amano, International Atomic Energy Agency director general:
"This is deeply regrettable and is in clear violation of UN Security Council resolutions."
"The IAEA remains ready to contribute to the peaceful resolution of the DPRK nuclear issue by resuming its nuclear verification activities in the country as soon as the political agreement is reached among countries concerned."
Statement from NATO:
"We condemn in the strongest terms the test by North Korea of a nuclear weapon, conducted in flagrant violation of relevant United Nations Security Council resolutions.
This irresponsible act, along with the December missile launch, poses a grave threat to international and regional peace, security and stability. North Korea's pursuit of weapons of mass destruction represents continued defiance of the UN Security Council and the broader international community."
William Hague, British foreign secretary:
"I strongly condemn this development, which is a violation of UN Security Council Resolutions 1718, 1874 and 2087. North Korea's development of its nuclear and ballistic missile capabilities poses a threat to international and regional security. Its repeated provocations only serve to increase regional tension, and hinder the prospects for lasting peace on the Korean Peninsula."
Francois Hollande, French president:
"I condemn in the strongest terms the nuclear test just made by North Korea,"