What does this have to do with China? These are mostly KIA insurgents who commit crimes in Myanmar and run into India. There are also some Indian insurgent groups like the NSCN (IM), NSCN (K), PLA etc who carry out strikes in India and hide in Myanmar when chased by IA. That is why this has to be a joint operation by India and Myanmar. There have been such operations in the past. Incidently, KIO/KIA also claim territory in the Unan province. I am sure the Myanmarese govt coordinated with China on that one.