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In the early 1870s Voynikov was close to the right-wing Band of Virtues group who assisted him in obtaining Russian citizenship; thus, Voynikov could return to Bulgaria in 1874.
In December 2010, he has received his first call up to Azerbaijan after impressing Berti Vogts and has been naturalised as citizen of Azerbaijan from Russian citizenship.
In June 2011, Diana Markosian, a freelance photographer for Bloomberg Markets magazine who holds dual US-Russian citizenship, was denied entry by Azerbaijani border officials at Heydar Aliyev International Airport in Baku on account of the fact that she was Armenian.