US President Joe Biden's administration plans to impose further restrictions on China's exports of artificial intelligence equipment and computer chips starting next month.
According to the Reuters news agency, the Commerce Department sent letters to three US companies earlier this year in which they expressed their intention to issue new regulations related to the sanctions.
Among these companies, letters were sent to KLA Corp, Lam Research Corp and Applied Materials, sources familiar with the matter said.

The said companies have publicly acknowledged the receipt of the letters. These letters prevent American companies from supplying chip-making equipment to China.
Earlier this month, chip designer Nvidia Corp said US authorities had barred it from exporting artificial intelligence chips to China.
Some sources say that these regulations will likely include further measures against China.
A commerce ministry spokesman on Friday declined to comment on specific regulations but reiterated that his ministry is taking a comprehensive approach with additional measures to protect national security and foreign policy interests. Is.
The new regulations come at a time when President Joe Biden's administration is trying to block China from acquiring advanced technologies. America still dominates in this sector.
Jim Lewis, a technology expert at the Center for Strategic and International Studies, says the strategy is to prevent China from acquiring the technology, and he's learned that chips are one thing China can't make.