I never flown in Russia before, only in Romania, but .. if I am not wrong, they use the metric system for everything: altitude/heights, speeds, METAR (cloud base, wind speed), etc. Even pressure is in mmHg and not in hPa. All russian airplanes I saw (AN-2, AN-24, AN-26, etc) have the altimeter in meters, the air speed indicator in km/h, etc. You might want to be very careful in case you'll fly alone.
Thing might have changed recently, please correct me if I'm wrong.