Both President Donald Trump and China sounded positive notes ahead of trade talks this week with Washington, but the two sides face potentially lengthy wrangling over technology and the future of their economic relationship.

The Associated Press reported that both sides have expressed an interest in settling their tariff fight over Beijing’s technology ambitions. Yet neither has indicated its stance has changed since a Dec. 1 agreement by Presidents Donald Trump and Xi Jinping to postpone further increases.

Envoys will have “positive and constructive discussions” during meetings in Beijing on Monday and Tuesday, said Chinese Foreign Ministry spokesman Lu Kang.

Trump expressed optimism about the trade negotiations Sunday, saying he spoke recently to Xi. “I really believe they want to make a deal. The tariffs have absolutely hurt China very badly,” Trump said.

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