We have a secret weapon that turns pilots into hotdogs.
12 August 1985; Japan Air Lines 747SR; Mt. Ogura, Japan: The aircraft had a sudden decompression that damaged hydraulic systems and the vertical fin. That damage also disabled the flight controls for the rudder and elevator. All 15 crew members and 505 of the 509 passengers were killed.
IOW, the pilot had little control, at the mercy of wind, gravity, fuel, and, as it turned out, the terrain. I can't remember how many hours the plane flew like that.
But, since the Russian crew didn't report any problems, they were either too busy celebrating, or the instruments weren't working correctly.
Hard to jam an altimeter and a map.