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... But behind closed doors, Chinese officials have grown increasingly alarmed about tariffs' impact on the economy and the risk of isolation as China's trading partners have started negotiating deals with Washington, according to three officials familiar with Beijing's thinking. ...

These factors, along with outreach by the U.S. and an easing of Trump's rhetoric, persuaded Beijing to send its economic tsar He Lifeng for meetings with U.S. counterparts in Switzerland this weekend, the officials told Reuters.

Re-engagement was complicated by the fractious nature of U.S.-China diplomacy. In particular, Beijing considered a letter the U.S. side sent to Chinese ministries in late April about fentanyl "arrogant," two officials said. Efforts to arrange talks were further impaired by disagreements over which officials should be involved, said one of these people and another official.

China's reasons for deciding to negotiate, Washington's letter on fentanyl, U.S. diplomatic challenges in Beijing, and the early outreach between the two sides are reported by Reuters for the first time, based on interviews with nearly a dozen government officials and experts on both sides. Most of the people were granted anonymity to discuss non-public information.

China's foreign ministry said in a statement to Reuters that it reiterated that "China's firm opposition to the U.S. abuse of tariffs is consistent and clear, and there is no change."

"The U.S. has ignored China's goodwill and unreasonably imposed tariffs on China under the pretext of fentanyl. This is a typical act of bullying, which seriously undermines dialogue and cooperation between the two sides in the field of drug control." ...