Nikolay Kruglov, Jr. (b. 1981), Russian biathlete and son of Nikolay Kruglov
In 2003, at the age of 18, Kruglov started his professional career with FC Levadia Tallinn, one of the biggest clubs in Estonia.
In the late 1990s, the well-known Russian filmmaker Leonid Kruglov visited Vainshtein with the proposal to produce a film about his expeditions into Tuva, using as a ‘red line’ Vainshtein’s correspondence with American Nobel laureate Richard Feynman, who had written him a letter in 1981 requesting his help in securing a visa to visit Tuva, which, was not granted during Feynman’s lifetime.