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(Image: GETTY)

Downing Street has been urged to “immediately cease all official diplomatic” relations with the Pyongyang by top dogs in Washington.

A letter sent to Britain’s ambassador in the US demanded the UK sever all ties with Kim and also back the rogue state’s explosion from the UN.

UK politicians are now also considering removing our ambassador to North Korea from his posting in Pyongyang.

Tensions continue to rage between Kim and Donald Trump over the rogue state’s development on ICBMs.

Britain faces being drawn into a conflict if the US went to war with North Korea.

Kim has lashed out at Britain – branding defence secretary Sir Michael Fallon “pig-headed”, and threatening the UK with a “miserable end”.

The letter from US Senator Cory Gardner, chair of the Senate’s committee on East Asia, said: “North Korea is an imminent and growing threat to global peace and stability.

“The UN Security Council has repeatedly condemned North Korea's illicit activities and has imposed sanctions against this outlaw regime… most recently under resolution 2375.

“Now is the time to diplomatically and economically isolate this regime, until it fully and irreversibly commits to peaceful denuclearisation.

“Maintaining official diplomatic relations with a regime that continues to defy international law and threatens nations across the globe only serves to reward nefarious behaviour.”

(Image: KCNA) (Image: GETTY)

The message to Ambassador Kim Darroch comes after a number of countries severed ties with the North.

Furious Spain publicly expelled its ambassador following Kim’s detonation of an H-bomb on September 3.

Kuwait, Peru, Mexico and UAE have all also banished their ambassadors – while Egypt, the Philippines and Uganda have all pulled back relations.

Liberal peer Lord David Alton of Liverpool has now tabled a question in the House of Lords asking the government for its assessment of Britain’s ties with the North.

Lord Alton, who is co-chair of the All-Party Parliamentary Group on North Korea, said he agreed that the UK should withdraw its ambassador from Pyongyang.

He said: “As a long time advocate of constructive but critical engagement I am in favour of keeping open a diplomatic channel.

“But in the light of recent developments this should be downgraded, by withdrawing our ambassador.

“Until such a time as North Korea indicates its willingness to comply with UN resolutions and a willingness to find a diplomatic solution, we should downgrade, rather than close our embassy.”

A Foreign Office spokesman said relations were under constant review, but defended the decision to maintain diplomatic ties.

He said: “At present, we judge that it is better to have open channels of communication where we can, in order to deliver tough messages directly to the regime.”

It emerged today allegedly the US is having back channel talks with North Korea in secret meetings in Russia.