Germany’s outspoken economy minister, Sigmar Gabriel, heads to China next week having ratcheted up tensions with Beijing by putting the brakes on the latest Chinese takeovers of German technology companies.

The five-day trip with 60 business executives comes a week after his ministry withdrew approval for Fujian Grand Chip Investment Fund (FGC) to buy chip equipment maker Aixtron (AIXGn.DE), citing new security concerns.

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