The Tu-134 "balkany" is a tactical airborne command post the name coming from the Balkany secure HF
communications suite that it is fitted with. The 'sting" in the back is identical to the "scorpion tail" on the top of the fin. Also features an extra 4 blade aerials(one on top of fuselage, top of fin, two under rear fuselage). About 40 glass-nosed Tu-134As were converted to Balkany standard and they seat between 26-31 people in VIP configuration. Eventually after the collapse of the USSR
some of the Balkanys became obsolete and were reconverted back to passenger configuration just like this one.
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Photo © Snorre - VIP Vienna International Planespotters
Notice how it's "chopped off" in the back