US President Donald Trump has called Chinese AI start-up DeepSeek's strong showing a "wake-up call" and "positive" for America's tech sector, and also warned that he would slap tariffs on foreign-made semiconductor chips,

The U.S. tried to slow China’s advances, but the startup showed how hard that is.

The emergence of the DeepSeek chatbot has sent Silicon Valley into a frenzy, with calls to go faster on advancing artificial intelligence and beat communist-led China before it is too