It comes despite Seoul setting up a specialised military team to confront nuclear threats from the North.

The United Nations Security Council unanimously imposed new, tougher sanctions on reclusive North Korea on Friday for its recent intercontinental ballistic missile test, a move the North branded an economic blockade and act of war.

South Korea's Unification Ministry said in a report today: ”North Korea will seek negotiation with United States, while continuing to pursue its effort to be recognised as a de facto nuclear-possessing country.”

However, Seoul did not offer any reasons for its conclusion.

The nation’s ministry of defence said it would assign four units to operate under a new official overseeing North Korea policy, aimed to "deter and respond to North Korea's nuclear and missile threat".

Tensions have risen over North Korea's nuclear and missile programmes, which it pursues in defiance of years of UN Security Council resolutions, with bellicose rhetoric coming from both Pyongyang and the White House.

US diplomats have made clear they are seeking a diplomatic solution but President Donald Trump has derided talks as useless and said Pyongyang must commit to giving up its nuclear weapons before any talks can begin.

In a statement carried by the official KCNA news agency, North Korea said the United States was terrified by its nuclear force and was getting "more and more frenzied in the moves to impose the harshest-ever sanctions and pressure on our country".

China, the North's lone major ally, and Russia both supported the latest UN sanctions, which seek to limit the North's access to refined petroleum products and crude oil and its earnings from workers abroad, while on Monday Chinese Foreign Ministry spokeswoman Hua Chunying called for all countries to ease tension. 

On Tuesday, Beijing released customs data indicating China exported no oil products to North Korea in November, apparently going over and beyond UN sanctions.

China, the main source of North Korea's fuel, did not export any gasoline, jet fuel, diesel or fuel oil to its neighbour last month, data from the General Administration of Customs showed.

China also imported no iron ore, coal or lead from North Korea in November.

In its 2018 forecast, South Korea's Unification Ministry said it believed the North would eventually find ways to blunt the effects of the sanctions.

The report said: ”Countermeasures will be orchestrated to deal with the effects, including cuts in trade volume and foreign currency inflow, lack of supplies, and reduced production in each part of the economy.”

The latest round of sanctions was prompted by the November 29 test of what North Korea said was an intercontinental ballistic missile that put the US mainland within range of its nuclear weapons.

The Joongang Ilbo Daily newspaper, citing an unnamed South Korean government official, reported on Tuesday that North Korea could also be preparing to launch a satellite into space.

Experts have said such launches are likely aimed at further developing the North's ballistic missile technology, and as such would be prohibited under UN resolutions.

The North Korean Rodong Sinmun newspaper said on Monday saying that "peaceful space development is a legitimate right of a sovereign state".

North Korea regularly threatens to destroy South Korea, the United States and Japan, and says its weapons are necessary to counter US aggression.

The United States stations 28,500 troops in the South, a legacy of the 1950-53 Korean War, and regularly carries out military exercises with the South, which the North sees as preparations for invasion.

North Korea is also under pressure due to China abiding by strict sanctions against the hermit state.

Figures show the Asian superpower exported no oil products to its controversial neighbour in November.

That came in the month Donald Trump asked president Xi Jinping to help pile pressure on North Korea to stop weapons testing.

The Seoul claims of North Korea seeking talks come after Russia warned tens of thousands of US citizens could die if conflict in the region breaks out.

Russian Security Council said the 250,000 Americans living in South Korea will be at risk if war ignites.

The group's secretary Nikolay Patrushev, made the warning as he slammed Mr Trump’s “cold war mentality”.

He said: "The United States is not accustomed to regarding the lives of other countries’ citizens to achieve its goals.

“However, Washington certainly cannot fail to take into account the fact that 250,000 Americans live in South Korea. 

"In the event of large-scale military operations on the Korean Peninsula, tens of thousands of US citizens will die.”