They don't have authority and jurisdiction to just "arrest" (aka kidnap in this case) people from other countries.
If they actually want to arrest someone, the local authorities need to do it, and they would agree only if the request is valid based on their international agreements, their asylum laws, etc.
If they actually want to arrest someone, the local authorities need to do it, and they would agree only if the request is valid based on their international agreements, their asylum laws, etc.