Taiwan said it has recalled seven representative officials from Hong Kong, citing "unreasonable political preconditions” for its personnel to operate in the city.

Hong Kong has been requesting since July 2018 that Taiwan’s representatives sign a "one China principle” commitment letter as part of visa requirements, Taipei’s Mainland Affairs Council said in a statement on Sunday. Taiwan adjusted the business operations at its representative office in Hong Kong from Monday, the agency said.

The personnel returned to Taiwan on Sunday, Mainland Affairs Council spokesman Chiu Chui-cheng said by phone. The Hong Kong government’s public relations office didn’t immediately respond to an email seeking comment.