Being in Russian team Semakov participated only at one Junior World (in 2006 in Presque Isle, United States) and two European championships (in 2006 he had his best career results competing as junior and winning three gold medals; in 2010 he won silver in men's relay and was 6th in individual race).

[citation needed] In summer 2014 Semakov together with Oleksander Zhyrnyi changed their citizenship to Ukrainian.

Three next seasons were more successful for him: he won some World Cup points and often ran in relay competitions.

[citation needed] Semakov qualified to represent Ukraine at the 2018 Winter Olympics.

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