Microsoft will apparently transfer some of the equipment from the plants to Vietnam, according to MarketWatch:

Microsoft, which bought Nokia's handset business last April, scheduled the closure of the plants -- located in Beijing and the southeastern city of Dongguan -- earlier this month and plans to ship some of the manufacturing equipment there to Vietnam, according to a report in the government-run Beijing Youth Daily.

The 9,000 jobs being cut will be part of the 18,000 jobs that Microsoft announced plans to cut in July 2014 following their acquisition of the Nokia Devices and Services division.

Source: MarketWatch