What country of origin does Alexei Tikhonov and Maria Petrova have in common?
Alexei Tikhonov Alexei Vladimirovich Tikhonov (Russian: Алексе́й Влади́мирович Ти́хонов ; born 1 November 1971 in Samara) is a Russian pair skater. With partner Maria Petrova, he is the 2000 World champion and a two-time (1999, 2000) European champion.
Nikita Petrov Nikita Vasilyevich Petrov (Russian: Ники́та Васи́льевич Петро́в , born 31 January 1957, Kiev) is a Russian historian. He works at "Memorial," a Russian organization dedicated to studying Soviet political repression. Petrov specializes in Soviet security services.