Former pilots with the German air force are training Chinese fighter jet pilots. The German defense minister is none too happy about it.

During an annual security conference in Singapore, German Defense Minister Boris Pistorius told his Chinese counterpart that it was unacceptable for the People’s Liberation Army to hire German fighter pilots, and the practice needed to end immediately.

Pistorius said Chinese Defense Minister Li Shangfu would not be amused if the situation were reversed. The two met for over an hour on the sidelines during the Shangri La Dialogue. Pistorius said the conversation was very open, with both Beijing and Berlin expressing their concerns clearly.