Beijing | Presidents Donald Trump and Xi Jinping wrapped up critical talks on Friday, claiming important progress in stabilising US-China relations even as deep differences persist between the world's two biggest powers on Iran, Taiwan and more.

Xi welcomed Trump at his official residence, Zhongnanhai, on Friday for the final talks of the summit before the US leader's return to Washington.

The leaders took a short walk through the grounds that feature ancient trees and Chinese roses, and strolled through a covered passageway with green columns and archways painted with birds and traditional Chinese mountain scenes.

Over tea and lunch, Trump and Xi - with top aides and translators in tow - huddled for nearly three hours of talks before the US leader completed his three-day visit to China.

"It's been really a great couple of days," Trump told reporters as he sat with Xi before the start of their meeting with aides.

Xi, for his part, called it a "milestone" visit. "We have established a new bilateral relationship, or rather a constructive, strategic, stable relationship," he said. (AP)