What is the difference between TM and R?

The TM symbol is used to show that the entity using the name claims a right to it and is governed at most local, state and foreign levels, while the R symbol shows that the name being used has been registered with and approved to carry the federal trademark registration. The R symbol may not be used while the registration is pending; it may only be used once the process is completed.

Foreign companies and brands may use the R mark to show that it is registered within their given country. The laws which control what symbols may be used by foreign properties can allow for this depending on the specific country's laws on trademarks and registration.