454 hours of flight time seems low for a military plane built in the 80's. That is not very many flights from the Soviet Union to off the U.S. coastline.
This aircraft was built in '87, by which time the Soviet economy was in serious trouble and training was at reduced levels. The Bear always projected a scarier image than was reality.
The US military-industrial complex amplified it for pocket-lining purposes.
Wouldn't the MIC over-emphasize Russian reliability whereas the rank-and-file tend to underestimate it?
Further, wouldn't RU do more or less the same, substituting design bureaus?
"Most Russian republics"? So, more than half of the 1?
And "Tu" is just an abbreviation for Tupolev, its not a particular plane of which there are variants. Saying a "TU variant" is like saying a Boeing variant.
And there are two different Tupolev strategic bombers that meet that general description (the Tu-22 and Tu-160), neither of which is a variant of the Bear.
So, name the 11 that have militaries that employ the bombers in question.