North Korea says there will be no changes in policy, despite its change of leadership.
In its first statement since Kim Jong-un was declared the new "supreme leader, the North Korean National Defence Commission said it would still refuse to talk to what it called the traitorous South Korean government.
The statement carried by state media said: "We declare solemnly and confidently that the foolish politicians around the world, including the puppet group in South Korea, should not expect any change from us."
The statement from the NDC - which is thought to be the country's top decision-making body - also said North Korea would "never deal" with South Korean leader Lee Myung-bak.
Mr Lee has angered Pyongyang by linking the provision of aid to progress on denuclearisation, the BBC reports.
The statement also criticised Seoul's "unforgivable" decision to allow only two non-official delegations to cross the border to pay their respects to Mr Kim.
North Korea held a national memorial service for Kim Jong-Il on Thursday, ending the period of mourning over the death from a heart attack on 17 December.
Meanwhile, the United States is sending its most senior regional diplomat to East Asia to discuss the implications of the political succession in the North.
Kurt Campbell will hold talks in Beijing, Seoul and Tokyo between 3 - 7 January 2012, the State Department announced.
