Determine the sentiment expressed in the news from financial perspective.
Options: positive, negative

NVIDIA Corporation (NASDAQ:NVDA) and Advanced Micro Devices, Inc. (NASDAQ:AMD) said the US government has told them to stop exporting certain high-performance chips to China. In a regulatory filing, Nvidia said the block on its artificial intelligence (AI) enabling had been imposed due to risk of the products being used or diverted to a "military end user".
negative