- 8 , ▁OK B ▁design ation ▁' 6 9 ', ▁was ▁a ▁long - range ▁variant ▁of ▁the ▁Soviet ▁T up ole v ▁Tu - 2 ▁medium ▁bom ber ▁that ▁first ▁fle w ▁after ▁the ▁end ▁of ▁World ▁War ▁II . ▁It ▁was ▁can ce led ▁when ▁it ▁proved ▁to ▁be ▁un stable , ▁struct ur ally ▁uns ound ▁and ▁its ▁gener ators ▁were ▁not ▁strong ▁enough ▁to ▁fully ▁power ▁its ▁gun ▁tur rets . ▁With ▁the ▁advent ▁of ▁jet - power ed ▁bom bers , ▁Soviet ▁military ▁pl ann ers ▁decided ▁that ▁it ▁simply ▁was ▁not ▁worth ▁dev oting ▁the ▁necessary ▁resources ▁to ▁fix ▁its ▁numerous ▁problems . ▁ ▁Development ▁After ▁the ▁end ▁of ▁World ▁War ▁II ▁the ▁T up ole v ▁OK B ▁decided ▁to ▁continue ▁its ▁development ▁of ▁long - range ▁variants ▁of ▁the ▁Tu - 2 ▁which ▁had ▁begun ▁with ▁the ▁un success ful ▁Tu - 2 D ▁during ▁the ▁war . ▁Intern ally ▁designated ▁as ▁the ▁AN T - 6 9 , ▁it ▁was ▁originally ▁planned ▁to ▁use ▁the ▁new ▁Sh vet so v ▁M - 9 3 ▁radial ▁engines , ▁but ▁this ▁was ▁changed ▁to ▁the ▁Sh vet so v ▁A Sh - 8 2 M ▁when ▁the ▁M - 9 3 ▁engine ▁was ▁delayed . ▁It ▁was ▁to ▁be ▁armed ▁with ▁ ▁Bere zin ▁B - 2 0 ▁can non ▁on ▁the ▁existing ▁mount s . ▁The ▁fus el age ▁nose ▁was ▁completely ▁re vised ▁in ▁response ▁to ▁compla ints ▁by ▁the ▁V VS ▁about