Following further enquiries and international media coverage of a Crimewatch appeal, Robinson handed himself to the Chinese authorities in April this year.
He was flown back to the UK the following month, and was arrested at Heathrow Airport before being charged.
Detective Inspector Becky Molyneux said: “Robinson is a dangerous and predatory sexual offender who did everything he could to try and escape punishment for his appalling crimes.
“I hope this case reassures the public that we will use all available methods and resources to relentlessly pursue those who commit serious offences of this nature.
“I would like to take this opportunity to thank DC Stacey Bolton for her tireless work on the renewed appeal for information on Robinson – her efforts led directly to us getting the information we needed to track him down.
“We are also extremely grateful to Crimewatch, the Chinese authorities and a number of other agencies for their assistance and co-operation in our attempts to ensure Robinson was swiftly returned to the UK.”
Robinson has been remanded in custody and is due to be sentenced on October 4.