President Donald Trump has accused China of exerting “negative pressure” on a possible US-North Korea nuclear deal, in the wake of tense talks with North Korean officials last week.

China, the president tweeted on Monday, “may be exerting negative pressure on a deal because of our posture on Chinese Trade - Hope Not!”

"I have confidence that Kim Jong Un will honour the contract we signed &, even more importantly, our handshake," he added. "We agreed to the denuclearisation of North Korea."

Mr Trump recently placed tariffs on billions of dollars worth of Chinese goods, accusing the country of stealing American intellectual property. Beijing retaliated with matching tariffs on $34bn worth of US imports, setting off a trade conflict between the world’s two largest economies.

It was unclear why Mr Trump accused the country of intervening in a possible deal with North Korea. The accusation came after two days of talks between Secretary of State Mike Pompeo and North Korean officials, as the two countries tried to hammer out the specifics of a denuclearisation pledge that Mr Trump and Mr Kim signed at a summit in Singapore last month.

Mike Pompeo meets with North Korean officials on visit to Pyongyang

Mr Pompeo called the latest talks “productive,” but North Korea’s Foreign Ministry denounced them as "deeply regrettable," accusing the US of forcing a “unilateral and gangster-like demand for denuclearisation”.

The two days of talks, the Foreign Ministry said, "brought us in a dangerous situation where we may be shaken in our unshakable will for denuclearisation, rather than consolidating trust between [North Korea] and the US".

While some saw the North's criticism as a negotiating tactic, Senator Lindsey Graham suggested China may have played a role in the about-face.

"We are in a fight with China," Mr Graham, a member of the Senate Armed Services Committee and occasional friend of the president, told Fox News. “They cheat and President Trump wants to change the economic relationship with China.”

He added: “There’s no doubt in my mind that it's the Chinese pulling a North Koreans back.”

North Korea: A road trip on the edge of the Chinese border Show all 20 1 /20 North Korea: A road trip on the edge of the Chinese border North Korea: A road trip on the edge of the Chinese border People have their picture taken with North Korea in the background, in Tumen, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. REUTERS North Korea: A road trip on the edge of the Chinese border A North Korean woman is photographed from the Chinese side of the Yalu River near the town of Changbai, China as she walks between houses in the North Korean town of Hyesan. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border North Korean souvenirs are displayed for sale on the banks of the Yalu River in Dandong in Liaoning province, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. Reuters North Korea: A road trip on the edge of the Chinese border A large screen, which faces North Korea, broadcasts propaganda videos on an island on the Yalu River between North Korea and China, in the town of Linjiang in Jilin province, China. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border A piece of clothing is used to make a gap in barbed wire near the closed bridge over the Yalu River on the Chinese side of the border with North Korea between towns of Ji'an and Linjiang, China. A week-long road trip along China's side of its border with North Korea showed places where it is porous. Reuters North Korea: A road trip on the edge of the Chinese border A tourist uses binoculars to look across to North Korea from a tower built on the Chinese side of the border between Russia (L), China (C) and North Korea (R) near the town of Hunchun in China. Reuters North Korea: A road trip on the edge of the Chinese border North Koreans are photographed from the Chinese side of the border as they stand next to the freezing Yalu River near the town of Linjiang, China. On a road trip along China's side of its border with North Korea, reporters found a group of North Koreans diving in the Yalu river who the Chinese locals said were searching for gold. REUTERS North Korea: A road trip on the edge of the Chinese border Women participate in a group dance exercise close to the Yalu River which runs between China and North Korea, in the town of Linjiang in Jilin province, China. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border A sign reading, "Take the initiative to preserve order along the border," stands in a field at the border between China and North Korea just outside Dandong, Liaoning province, China. Reuters North Korea: A road trip on the edge of the Chinese border A couple prepare for a wedding photography session on a boat which takes tourists on sightseeing tours from the Chinese side of the Yalu River, close to the shores of North Korea, near Dandong, Liaoning province, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. REUTERS North Korea: A road trip on the edge of the Chinese border Tourists travel on a boat taking them from the Chinese side of the Yalu River for sightseeing close to the shores of North Korea, near Dandong, Liaoning province, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. REUTERS North Korea: A road trip on the edge of the Chinese border North Koreans are photographed from the Chinese side of the border as they stand next to the freezing Yalu River near the town of Linjiang, China. On a road trip along China's side of its border with North Korea, reporters found a group of North Koreans diving in the Yalu river who the Chinese locals said were searching for gold. REUTERS North Korea: A road trip on the edge of the Chinese border Women walk across a bridge from an island on the Yalu River, dividing North Korea and China, in the town of Linjiang in Jilin province, China. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border A North Korean soldier and locals are photographed from the Chinese side of the border north of Dandong, China as they stand on the banks of the Yalu River, north of Sinuiju, North Korea. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border North Korean girls are photographed from the Chinese side of the border as they collect water from the frozen Yalu River near Linjiang, China. A week-long road trip along China's side of its border with North Korea revealed stark contrasts between China's bright towns and North Korea's dark villages. REUTERS North Korea: A road trip on the edge of the Chinese border A man looks through binoculars towards North Korea on the Broken Bridge over the Yalu River that connects the North Korean town of Sinuiju and Dandong in Liaoning Province, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. REUTERS North Korea: A road trip on the edge of the Chinese border North Koreans are photographed from the Chinese side of the border as they stand next to the freezing Yalu River near the town of Linjiang, China. On a road trip along China's side of its border with North Korea, reporters found a group of North Koreans diving in the Yalu river who the Chinese locals said were searching for gold. REUTERS North Korea: A road trip on the edge of the Chinese border North Korean fishermen are seen as a Chinese flag flutters from the Broken Bridge as the sun sets over the Yalu River between the North Korean town of Sinuiju and Dandong in Liaoning Province, China. In the Chinese city of Dandong, signs of neighbouring North Korea are pervasive. REUTERS North Korea: A road trip on the edge of the Chinese border North Koreans are photographed from the Chinese side of the border as they stand in the freezing Yalu River near the town of Linjiang, China. On a road trip along China's side of its border with North Korea, reporters found a group of North Koreans diving in the Yalu river who the Chinese locals said were searching for gold. REUTERS North Korea: A road trip on the edge of the Chinese border Women, photographed from the Chinese side of the border, are seen through binoculars fixed on a building on the Chinese side of the border for sightseers to look across to North Korea, as they cross the bridge from Namyang in North Korea towards the town of Tumen in China, Reuters

China is North Korea’s largest trading partner and advocate in the region. Mr Kim visited Chinese President Xi Jinping after the Singapore summit last month – his third visit of the year – and agreed to deepen ties and strengthen communication between the two countries.

Mr Trump claimed North Korea was "no longer a nuclear threat," after the Singapore summit in June, where Mr Kim signed an agreement reaffirming his "firm and unwavering commitment to the complete denuclearisation of the Korean peninsula".

But Mr Pompeo appears to have had little success tying the North to any concrete steps towards this goal, and recent intelligence reports suggest the country has not actually stopped producing fuel for its nuclear weapons.

Asked about North Korea's harsh comments this weekend, Mr Pompeo told reporters: “When we spoke to them about denuclearisation, they did not push back."