Fighter aircraft are the most aggressive aircraft in war but their role is essentially defensive: to protect ones own airspace, or to protect ones own aircraft when they enter enemy airspace. The aircraft that carry out the offensive policies of a nation are the bombers. The goal of tactical bombing is to aid ground forces. Transportation and supply facilities in the area of battle are bombed, as are fortresses and gun-emplacements. For this bombing strategy, a nation can reveal itself to all other nations.
Here in this video, you can see a massive bomber plane of Russia that is the biggest bomber plane of this nation in the past. They invents this bomber after a few year of first invention of plane. The name of this plane is Kalinin K-7 that was a heavy experimental aircraft designed and tested in the Soviet Union in the early 1930s. The K-7 first flew on 11 August 1933. The aircraft completed seven test flights before a crash due to structural failure of one of the tail booms on 21 November 1933. Its wingspan was close to that of a B-52 and a much greater wing area. The K-7 was one of the biggest aircraft built before the jet age. It had an unusual arrangement of six tractor engines on the wing leading edge and a single engine in pusher configuration at the rear.

As civil transport, it would have had a capacity for 120 passengers and 7,000 kg (15,000 lb) of mail. As a troop transport it would have had capacity for 112 fully equipped paratroopers. In bomber configuration it would have been armed with 8 x 20mm autocannons, 8 x 7.62mm machine guns and up to 9,600 kg (21,200 lb) of bombs. Actually this massive plane was a great invention that time.

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