By Joe Cash, Trevor Hunnicutt and David Brunnstrom BEIJING/WASHINGTON, September 21 (Reuters) - In the four months since the leaders of the two global superpowers last met, Xi Jinping has overseen a surge in China's trade with the world while Donald Trump has struggled with falling approval ratings at home.

Beyond warm meetings between their leaders, the countries are engaging in tit-for-tat measures that call into question the stability of their arrangement.

FILE PHOTO: Politburo Standing Committee member Cai Qi walks past Chinese President Xi Jinping and Chinese Premier Li Qiang as they arrive for the closing session of the National People's Congress (NPC) at the Great Hall of the People in Beijing, China March 12, 2026. REUTERS/Tingshu Wang/File Photo

President Donald Trump says that communism is the greatest threat the U.S. has ever faced. But he's hosting the leader of the world's most powerful communist country this week — Chinese President Xi Jinping.

In recent days Washington has faced calls to slow down the development of AI over fears abouts its potential negative impact on humanity. Trump has largely dismissed those concerns, arguing that there are sufficient policies around AI and that the US cannot lose its edge to China.

Nvidia (NVDA) stock rose as Trump-Xi talks put H200 chip sales to China and a potential $30 billion revenue opportunity in focus.

The risks of artificial intelligence are expected to be a focus as U.S. President Donald Trump and Chinese leader Xi Jinping prepare to meet in Washington.

China expert Gordon Chang claims Xi Jinping is preparing China for war against the U.S. as President Donald Trump hosts a high-stakes summit Thursday.