Key Highlights -U.S. ordered TSMC to halt advanced chip shipments to Chinese clients, effective Monday -Commerce Department sent an is-informed letter imposing export restrictions on AI chips to China -Order follows TSMC's chip presence in a Huawei AI processor, breaching U.S. export controls -Huawei listed on restricted trade list, requiring licenses for tech shipments -TSMC suspended shipments to France-based Sophgo over matching chip found in Huawei processor -Move allows U.S. to assess potential diversion of AI chips to Huawei by other firms -Commerce had previously sent restriction letters to Nvidia, AMD, and chip equipment makers -Latest action amid bipartisan concerns over inadequate Chinese tech export controls -Publishing of new export rules delayed, with important plans yet to be issued.