Take a look at the beta version of dw.com. We're not done yet! Your opinion can help us make it better.
The European Union has strongly condemned North Korea's nuclear test as "unacceptable." Germany, the United States and China have slammed the test as a provocation and demanded a tough United Nations response.
North Korea's leader said the alleged underground nuclear test was a "great leap forward"
"Carrying out the test was unacceptable," the EU said in a statement, adding that "the test profoundly jeopardizes regional stability and represents a severe threat to international peace and security."
However, the EU has also said it has no plans to cut humanitarian aid to North Korea.
NATO Secretary General Jaap de Hoop Scheffer strongly condemned North Korea's reported nuclear test and called an emergency meeting of the alliance's ambassadors.
After talks with members of the European Union's political and security committee, including EU foreign policy chief Javier Solana, de Hoop Scheffer said North Korea's test "…flies into the face of the international community." He also said that "it is a threat to world peace and security and will demand the strongest possible reaction from the international community."
Germany has meanwhile summoned North Korea's ambassador to the foreign ministry. Germany condemned North Korea's reported test of a nuclear weapon and called for a "determined reaction" from the UN Security Council.
A South Korean protester burns a banner showing Kim Jong-Il during an anti-North Korea rally in Seoul on Monday
Foreign Minister Frank-Walter Steinmeier urged the communist state to stop its nuclear weapons program immediately and to refrain from carrying out further tests.
German government spokesman Ulrich Wilhelm said North Korea's test "is an irresponsible step that will significantly increase tensions in the region."
"Non-proliferation of nuclear weapons is an extremely important concern of the entire international community," he added.
First nuclear test
On Monday, Pyongyang said it had conducted it first underground atomic test Sunday evening, which the official Korean Central News Agency described as an "historic event" aimed at bettering peace and security.
The 15-member United Nations Security Council scheduled an emergency meeting on the North Korean test on Monday.
China, Pyongyang's closest ally in the region, expressed its "resolute opposition" to the "brazen" nuclear test.
"China strongly demands the DPRK (North Korea) side to undertake its commitments to the non-nuclearization of the Korean Peninsula, and stop all actions that can lead to the deterioration of the situation," the foreign ministry said in a statement on state television.
China also urged North Korea to return to six-party talks aimed at reining in Pyongyang's nuclear program.
North Korea's isolation makes it difficult for the many people hungry to receive aid
South Korea angrily described North Korea's Monday nuclear test as a betrayal and said its policy of engagement -- a lifeline for the impoverished Stalinist state -- is under threat.
"This is a grave threat to peace, not only on the Korean peninsula but in the region," President Roh Moo-Hyun said in his first response to the North's announcement which shocked the world.
It said it is considering whether or not to suspend a scheduled aid shipment to North Korea.
Japan and the United States have said they will step up work on their missile defense system, and Japan says it's considering stern measures immediately on North Korea's nuclear testing.
More tests possible
Meanwhile, South Korean authorities have been reporting unusual activities in a rugged area in North Korea on Monday, causing them to suspect that the communist state might be preparing a second nuclear test, a news report said.
Kim Seung-Gyu, head of South Korea's spy agency, told parliament that activity involving vehicles and some 30 to 40 people was under way at Punggyeri in the north-eastern county of Kilju, Yonhap news agency reported.
AFP news agency quoted South Korea's intelligence chief, Kim Seung-Gyu, who said North Korea is believed to have stored up to 40 kilograms (88 pounds) of plutonium, enough to make as many as seven nuclear bombs.
A 2001 satellite image of the Taepodong missile launch complex in North Korea -- the nation test-fired various missles in July
North Korea's alleged underground nuclear blast has defied international pressure to keep the secretive regime from becoming one of the world's nuclear powers.
It came just three days after a unanimous call from the UN Security Council for North Korea to abandon plans for testing a nuclear weapon.
North Korea is not a signatory of the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which was adopted in 1996 by the United Nations General Assembly and ratified by 135 states.
A decade after its adoption, the treaty has yet to come into force because not all of the nations with nuclear capacity have ratified it.
Of the seven countries known to possess nuclear weapons, only France, Britain and Russia have ratified the text. The United States, China have signed but not ratified it, while India and Pakistan have refused to sign.
AFP news agency has said that, in all, just over 2,047 nuclear weapons tests have been officially reported to have taken place throughout the world since the first blasts in 1945. Of that total, 1,032 were carried out by the United States and 715 by the Soviet Union.