Myasischev M-17 "Mystic" is high-altitude spy-plane. Total 4 was built, later modifications was called M-55 "Geophysika". Now using for metheorological utilities. Look at fake civil Aeroflot registration :-)
Unfortunately all Mi-6 was grounded in 2002. This beautiful heli was very important and usefull in north part of Russia. Mi-6 was replaced by it's bigger brother Mi-26.