China recently banned a foreign Wells Fargo executive and a United States government employee from leaving its territory, spotlighting its opaque judicial and security system and rekindling concerns over the risks facing foreign companies and nationals operating there.

Demand in China has begun surging for a business that, in theory, shouldn't exist: the repair of advanced Nvidia artificial intelligence chipsets that the U.S. has banned the export of to its trade and tech rival.

In May, multiple Chinese distributors started selling B200s to suppliers of data centres that serve Chinese AI groups, according to documents reviewed by the FT.