South Korea is not sure about the possible nuclear weapon testing which can be in progress in North Korea and yet expects more signs from its closest neighbor to ask for any sanction for it.

``There are no particular signs regarding a nuclear test, as reported by the media. North Korea is well aware that if it pushes ahead with a nuclear test it would only isolate itself from the international community,’’ said Kwon Jin Ho, the president’s National Security Advisor.

In October 2002, official Pyongyang acknowledged it was enriching uranium, thus violating a 1994 international agreement. In February, North Korea claimed it manufactured nukes and did not want to take part in six-party talks.

The United Nations warned North Korea it faces sanctions if the organization sees any sign of enriching uranum for developing nuclear weapons. Earlier, it was said Korea could have manufactured as many as 10 nuclear weapons.

North Korea said any sanction from the UNSC will be regarded as one step closer to war.

South Korea does not admit any threat from its neighbor so far. "So far, no unusual moves have been detected. Such talk stems from misgivings or apprehensions in a corner of the US. We don’t need to take it seriously," according to one South Korea official.