The ".RS" is the ccTLD for Serbia, while the corresponding IDN is ".СРБ" (cirilic) which is registered separately, and at the moment there is no ownership relevance between the two. In the case...
No. The RS central registry, RNIDS, no longer requires documentation to register a .RS domain.
No. There is no residency requirements for .RS domains. RS domain names are available for registration worldwide.
No. There is no special requirements for .rs registration. Anybody can register a .RS domain.
The minimum registration period for .rs domains is 1 year, and the maximum registration period is 10 years.
Anybody can register a .RS domain. A Registrant can be a domestic or foreign, physical person or legal entity.