Commentary
Normally, when countries seek each other’s assistance on criminal matters, they first seek to establish a bilateral agreement on information exchange. Then, once this is achieved, they identify agencies of like-minded mandates to collaborate with each other. This is how mature nations conduct business among themselves.
Say, for example, that person A is wanted for a serious crime in China but travels/escapes to Canada. If the People’s Republic of China (PRC) and Canada have an extradition treaty in place, the former can ask the latter (through the RCMP, for example) to arrest the suspect and hand him or her over for detention and trial (not that Chinese trials are free and fair but that is a completely different matter)….