By Che Pan and Brenda Goh

BEIJING (Reuters) -China Unicom has built a massive data centre powered by domestically developed artificial intelligence chips from Alibaba and other companies, state broadcaster CCTV said, as Beijing seeks to wean itself off foreign technologies.

The news comes as U.S. officials voiced national security concerns at trade talks with China in Madrid this week, aiming to block shipments of chips and other advanced technology.

Amid the tension China has grown increasingly keen for domestic firms to switch to homegrown chips, warning them against use of those made by U.S. giant Nvidia, on security grounds.

China Unicom’s $390-million data centre, in Xining, the capital of the western province of Qinghai, will possess computing capacity of 20,000 petaflops when co

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