Two Russians, Andrei Lugovoi and Dmitry Kovtun,
have been accused of killing Litvinenko, an accusation both of them deny.
In addition, the crew of Pugachev and Litvinenko, with whom Konstantin fought in the same tank before, got in touch.
At that moment, General Litvinenko, the head of the NKT Grau(Scientific Committee of the Main Artillery
and Missile Control), made the diagram very well and clearly demonstrating how effective the 152 mm caliber is for the tank.