Amazon closes Shanghai AI research lab in latest cost-cutting move

1. Amazon closes AI research lab in Shanghai, citing U.S.-China tensions. 2. Recent layoffs at AWS affect marketing, training, and certification teams. 3. Geopolitical tensions increase operational challenges for U.S. companies in China. 4. Amazon's past exits from China include shutting its Kindle store. 5. CEO expresses optimism about emerging stronger from tariff uncertainties.