China has stepped up its tech war with the United States, blocking Facebook owner Meta’s US$2.5 billion acquisition of artificial intelligence (AI) start-up Manus and raising cybersecurity concerns about Anthropic’s new AI model Claude Mythos Preview. The National Development and Reform Commission (NDRC) announced it was prohibiting the Manus deal in a one-sentence statement on Monday, which didn’t give a specific reason. Meta is now planning to unwind the acquisition, which means untangling...