- Fentanyl -

The fentanyl trade has long been a sore point in relations between China and the United States: Washington accuses Beijing of turning a blind eye to the illegal trade in the drug, a charge it denies.

Trump hit China with a 20 percent levy on Chinese imports over complaints about its exports of chemicals used to make fentanyl.

However, he said after the talks in Busan the tariffs would be reduced to 10 percent -- bringing overall US tariffs on Chinese goods to 47 percent.

Trump said Xi "agreed that he was going to work very hard to stop the flow" of the powerful opioid, which has killed thousands of Americans.

"I believe he's going to work very hard to stop the death that's coming in," Trump told reporters on Air Force One.

- Hill of beans -

Beijing retaliated against Trump's fentanyl tariffs with levies against US agricultural products, including soybeans.

More than half of US soybean exports went to China last year, but Beijing halted all orders as the trade dispute deepened.

US farmers have been badly hit by the tariff war and are a key source of domestic political support for Trump.

Trump said China had now agreed to purchase "tremendous" amounts of soybeans, as well as other farm products.

"That was a very nice gesture," he said of the talks that he described as a "great meeting".

- Rare earths -

A strategic field dominated by China that is essential for manufacturing in defence, automobiles and consumer electronics, rare earths were expected to occupy a central role in the Busan talks.

Beijing imposed sweeping export controls on the materials and related technology this month.

Trump swiftly announced retaliatory tariffs of 100 percent on all Chinese goods, which were originally due to come into effect on Saturday.

But the US leader insisted on Thursday that "that whole situation, that roadblock is gone now".

"There's no roadblock at all on rare earths -- that will hopefully disappear from our vocabulary," he said, without giving details.

China's commerce ministry confirmed the restrictions on rare earths had been suspended "for one year".

Washington in turn agreed to suspend for one year a move imposing "Entity List" export restrictions on affiliates of blacklisted foreign companies in which they had at least a 50 percent stake, a Chinese spokesperson said.

The United States also agreed to suspend for one year its Section 301 investigation into China's shipbuilding industry that led to both sides applying port fees against each other's ships, they said.

China would suspend its "countermeasures" after the US action, they added, also for one year.

- Ukraine -

Trump said the United States and China have also agreed to cooperate more on seeking an end to the war in Ukraine.

China says it is a neutral party in the conflict, but Kyiv and Western governments have long accused Beijing of providing political and economic support to Moscow.

Trump told reporters the subject had come up "very strongly" during his talks with Xi.

"He's going to help us, and we're going to work together on Ukraine," Trump said.

- Chips -

Beijing has ramped up its chip industry to beat Washington's export restrictions on the critical component used to power artificial intelligence systems.

US chip giant Nvidia has been caught in the middle of that geopolitical tussle. Nvidia's chips are currently not sold in China due to a combination of Beijing government bans, US national security concerns and ongoing trade tensions.

Nvidia chief executive Jensen Huang has urged the United States to allow the sale of US-made AI chips in China in order to ensure Silicon Valley companies remain a global powerhouse in providing artificial intelligence.

"We did discuss chips," Trump said after meeting Xi, adding that Huang would speak to Beijing about the dispute.

"We're sort of the arbitrator or the referee," Trump said.

Huang is currently in Gyeongju, South Korea for the Asia-Pacific Economic Cooperation (APEC) CEO summit, which Xi is also expected to attend.

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NVIDIA