Blimey the Mi-10, forgotten that! During a leaflet lifting run round the London airline offices in the mid 1970s, Aeroflot gave me a very nice book illustrating all their activities which included pics of the 10 with a coach on the platform (can't recall if the old folks were still aboard on their day trip to St Petersburg-by-the-Sea) and also images of the mighty flying meccano set Mi-12...
Oddly enough I don't think it mentioned spying activities using the glazed navigator noses on many of its transport aircraft..
Might still have it in the loft.
Incidentally, back in 1999, I spent an hour at Hayward Municiple Airport while a mate was getting a check flight, looking at a twin rotor helicopter of the intermeshing kind on the far side but not fully visible or identifiable even with a pair of binoculars. Definitely not a Kaman Husky or K-Max but possibly a Kamov of some type. We drove round to take a look but it wasn't visible at all from outside. Just curious as to what it was, possibly just a film mock up.