I recently bought an used monthly French magazine from September 1979 with interesting articles about the Soviet Air Power, and tend to anticipate the characteristics of several systems, making them more dangerous than they were. An article also concern the case of the name of the "Backfire" and its capabilities, so as to share this extract with you ! 
  
"The last addition of the Soviet Strategic Aviation is the Tu-122 (or Tu-26) Backfire which 50 units are already in active service. This aircraft remember that the USSR is detremined to stay at a high degree on her triple nuclear base: ground-to-ground intercontinental ballistic missiles, submarines launched ICBMs and air-to-ground cruise missiles. The United States already adopted this triad during the 50's. Their recently decision to equipped the USAF with the recent Rockwell International B-1A, added to the terrifiant B-52, shurely justified the decision of the Russians to go forward in their strategic bomber fleet modernisation. 
The B-1 will be even more powerful than the Backfire. 
But, if the B-1 prototype flies since 1974, it still isn't developped - and his own program looks to be questioned - while the Backfire is already operational; and, as we saw it, 50 units are in service. This terrible, three crew (!!), swept-wings bomber is powered by two high-by-pass NK-144 turbofans, equipped with afterburners. 
His aerodynamics characteristics are surprisingly advanced. His ultramodern equipment included a doppler radar, an inertial navigation system, a ground proximity radar, a computer and an advanced RWR. His weapons inventory includes a 37mm tail cannon. It carried 15x500kg conventional bombs or 8 tonnes of nuclear weapon in its bombay or two AS-6 cruise missiles under the wings. The AS-6, which the Western intelligence informations agree to give them a range of 800 km, are firstly guided by an inertial unit and by radar on final phase. 
The Backfire has a range of 5 715 km at high altitude, and 2 480 km at low altitude. It is capable of more than Mach 2 at high level, and probably has a cruise speed of Mach 0.82 at low level." 
  
Tu-26 Backfire A and B characteristics 
  
Type : strategic bomber 
Powerplants : two turbofans (probably NK-144), capable of 22 000 kg of thrust 
Lenght : 41,20 m 
Wingspan : 
  Spread : 33,50 m 
  Swept : 26,80 m 
Height : 12,00 m 
Empty weight : 55 000 kg 
Max. weight : 123 350 kg 
Performances : 
   Max speed : 2 450 km/h 
   Service ceilling : 19 000 m 
   Range : 5 750 km 
   Ferry range : 12 9000 km 
  
  
It is impressive to see that apart some errors the inteligences already had a good idea of the aircraft capabilities at this times, and yet, it still are a public article.