North Korea has accused the United States of being "more and more hell-bent on hostile acts" against Pyongyang, despite the recent historic meeting between US President Donald Trump and North Korean leader Kim Jong-un.

Key points: The US wants UN member states to comply with sanctions on North Korea

The US wants UN member states to comply with sanctions on North Korea All North Korean migrant workers are due to be repatriated by December

All North Korean migrant workers are due to be repatriated by December Overseas workers are an important source of income for the reclusive regime

In a statement, the mission said it was responding to a US accusation that Pyongyang breached a cap on refined petroleum imports and a letter it said was sent on June 29 by the US, France, Germany and Britain to all UN member states urging them to implement sanctions.

"What can't be overlooked is the fact that this joint letter game was carried out by the permanent mission of the United States to the UN under instruction of the state department, on the very same day when President Trump proposed for the summit meeting," the statement said.

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Mr Trump became the first sitting US president to set foot in North Korea on Sunday when he met Mr Kim in the demilitarised zone (DMZ) between the two Koreas.

The pair agreed to resume stalled talks aimed at getting Pyongyang to give up its nuclear weapons program.

The North Korean UN mission said the June 29 letter "speaks to the reality that the United States is practically more and more hell-bent on the hostile acts against the DPRK, though talking about the DPRK-US dialogue".

North Korea is subject to a plethora of sanctions in response to its nuclear and ballistic missile programs, with exports including coal, textiles and seafood banned, and a cap on petroleum imports.

The letter urged all UN member states to comply with security council sanctions requiring the repatriation of all North Korean workers by December.

Overseas workers are an important source of foreign currency for the reclusive regime, sending home hundreds of millions of dollars a year.

"It is quite ridiculous for the United States to continue to behave obsessed with sanctions and pressure campaign against the DPRK, considering sanctions as a panacea for all problems," the North Korean mission said.

Following Sunday's meeting between Mr Kim and Mr Trump, US Secretary of State Mike Pompeo said a new round of denuclearisation talks would likely happen, "sometime in July … probably in the next two or three weeks".

The US has said there must be strict enforcement of sanctions until Pyongyang acts, while Russia and China have suggested easing the measures.

Reuters/ABC