There is of course no US-issued license to handle dollars as such, but the US has several levers that they can use to make it as difficult as possible. SWIFT is

There is of course no US-issued license to handle dollars as such, but the US has several levers that they can use to make it as difficult as possible. SWIFT is a Belgian company, but it can and has been successfully pressured by the US and its allies to disconnect users from the network. SWIFT is of course just a messaging system, but those users now have to use other means to transfer money, which is likely slower and more expensive for everyone involved.