During the war, Niko both witnessed and committed numerous atrocities, which led to his cynical perspective on life, and a certain degree of regret, depression, and emotional detachment.

What is Niko Bellic personality?

Personality… cynical, no-nonsense, and perpetually calm. Niko is a polite man who is quiet and helpful to those he works with. Hes intensely protective of his loved ones and will do anything to keep them safe.

Why did Dimitri Rascalov betray Niko?

Dimitri was to collect heroin and sell it to a third party, who would in turn pay Niko and Phil Bell. Dimitri betrays Niko as expected and leaves him and Phil trapped in the compound, forcing them to fight their way to the money and escape the compound.