You are welcome with your UAV in Tatarstan.
Tatarstan is an autonomous Republic within Russia, the Russian Aviation rules apply here.
Maximum take-off weight: No limit
Maximum hight: No ristrictions yet, but just be wise.
Maximum horizontal distance: Keep visual contact with UAV
Minimum age: -
Distance Airports / Heliports: 10 km / 6.3 mi.
Night flights: Prohibited
Prohibited: Do not fly above historic buildings
Useful link: State Civil Aviation Authority Russia (SCAA)
Contact information: +7 0951555395