US President Donald Trump says talks with North Korea are "going well", claiming that without him, the United States "would now be at war with North Korea".

Key points: Mr Trump says "Asia is thrilled" with his work in North Korea

Mr Trump says "Asia is thrilled" with his work in North Korea US delegation met with North Korean counterparts to discuss implementing summit's declaration

US delegation met with North Korean counterparts to discuss implementing summit's declaration White House announces US Secretary of State Mike Pompeo will travel to North Korea this week

His comments on Twitter came as US officials seek to reach an agreement with Pyongyang over a denuclearisation plan following last month's summit between Mr Trump and North Korean leader Kim Jong-un.

US Secretary of State Mike Pompeo is scheduled to travel to North Korea on Thursday to take the next step in negotiations, in his first official visit to Pyongyang since the summit on June 12 in Singapore.

In a tweet, Mr Trump said North Korea has conducted "no Rocket Launches or Nuclear Testing in 8 months".

"Many good conversations with North Korea-it is going well!" Mr Trump said, echoing his sentiments following the historic meeting with Mr Kim in Singapore.

"All of Asia is thrilled. Only the Opposition Party, which includes the Fake News, is complaining."

"If not for me, we would now be at War with North Korea!

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A US delegation met over the weekend with North Korean counterparts at the border between North and South Korea to discuss the next steps to implementing the June 12 summit's declaration, according to the US State Department.

The White House has characterised ongoing meetings as positive but not commented on recent news reports of US intelligence assessments saying North Korea has been expanding its weapons capabilities.

Mr Pompeo's visit to Pyongyang this week will build on talks started at the Singapore summit. ( AP: Jung Yeon-je )

Less than three weeks ago, Mr Pompeo said the US wanted North Korea to take "major" nuclear disarmament steps within the next two years — before the end of Mr Trump's first term in January 2021.

Even that was viewed as bullish by non-proliferation experts considering the scale of North Korea's weapons program and its history of evasion and reluctance to allow verification of disarmament agreements.

But on Sunday, Mr Trump's national security adviser, John Bolton, publicised an even more ambitious one-year plan that he said Mr Pompeo will be discussing with the North Koreans.

Mr Bolton, who has expressed hard-line views on North Korea, said if Pyongyang has decided to give up its nuclear weapons program and is cooperative, then "we can move very quickly" and they can win sanctions relief and aid from South Korea and Japan.

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