LONDON — American and Chinese delegations arrived at Lancaster House in London on Monday morning to begin a new round of trade negotiations, with rare-earth minerals and advanced technology at the center of the talks. The meeting follows a phone conversation last week between President Donald Trump and President Xi Jinping that helped pave the way for the diplomatic thaw.

“The talks have begun,” a U.S. official said moments after the delegations entered Lancaster House, a historic and grand government building near St. James’s Palace that is frequently used by the UK government for high-level diplomatic events, including international summits and state functions.

The two sides are looking to move past a breakdown in Geneva last month, where an initial agreement to scale back tariffs—some

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