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Hello, this is Katie Foley writing to you from London. This morning in the newsroom, we've been watching the final few hours of U.S. President Donald Trump's trip to China — which included a bilateral meeting with President Xi Jinping over tea and a working lunch at Zhongnanhai garden, adjacent to the Forbidden City.

Diplomatically and symbolically, the trip looks like a success. On the substance of the issues, though, it's too early to tell. And upon the president's return to the White House tonight, one key issue persists — namely, Iran.

Trump said Chinese leader Xi Jinping is "all business, no games," in a pre-recorded interview with Fox News that aired Thursday evening stateside. Trump also said China has agreed to buy American oil, to help with Iran negotiations and not to supply military equipment to Tehran, adding that the Chinese leader would like to see the Strait of Hormuz open and free of tolls. On the corporate front, Trump said China has agreed to buy 200 Boeing jets.

Here in London, we'll be closely watching the gilt and stock