China’s ambassador to the United States, Xie Feng, on Tuesday urged Washington to avoid crossing Beijing’s “red lines” following last week’s trade truce between Presidents Xi Jinping and Donald Trump.

Speaking via video link at the U.S.-China Business Council’s annual conference in Shanghai, Xie said the Busan summit between Xi and Trump had “recalibrated” the direction of ties at a crucial moment, easing tensions that had worried business communities on both sides.

“The most important thing is to respect each other’s core interests and major concerns,” Xie said. He listed Taiwan, democracy and human rights, China’s political system, and its right to development as Beijing’s four “red lines,” adding that any attempt to cross them would cause trouble.

Xie called for both nations to faithfully implement the trade and economic consensus reached in Busan and Kuala Lumpur talks.

"Be it tariff war or trade war, or industrial war and tech war, all will lead to nothing but a dead end," he said.

He urged U.S. businesses to seize the “positive momentum” from the summit and deepen investment in China, highlighting opportunities from the country’s next five-year development plan and reforms to open its services sector.

However, Xi’s speech came after Trump said on Monday that Nvidia’s (NASDAQ:NVDA) most advanced Blackwell chips will be reserved for U.S. companies and kept out of China for security reasons.