The regulation of domains in .RU and .SU zones differs from other zones in that for domain registration it is necessary to provide passport data or data and state registration.
Any passport is suitable for registration, not necessarily Russian.
More details on the rules for registering domains in these zones can be found here:
The speed of domain registration depends on the correctness and completeness of the data provided. If the data you provided is incomplete or fictitious, the domain registration application will not be submitted. After reviewing it, you will be asked to fill in the contact details of the domain administrator.