Máš pravdu.

Niko was born in Eastern Europe, most likely the Balkans.

Niko grew up in the harsh environment of the Yugoslav Wars, and was a teenage soldier of presumably the Serb-controlled Yugoslav People's Army or its many aligned Serbian paramilitary forces and militias

http://gta.wikia.com/Niko_Bellic
Takže ruský přízvuk nemá no, to byl fail..