[2] At the 2012 European Aquatics Championships in Debrecen, Hungary in May, Strelnikov placed fifth in the final of the 100 metre breaststroke with a time of 1:01.12, finishing 0.19 seconds behind the bronze medalist in the event Mattia Pesce of Italy.

[5] On the second day of the 2013 World University Games, held at the Palace of Water Sports in Kazan in mid-July, Strelnikov placed fourth in the final of the 100 metre breaststroke, finishing with a time of 1:00.48 that was 0.12 seconds slower than the bronze medalist Edoardo Giorgetti of Italy.

[18] For the 2021 International Swimming League regular season, conducted in short course metres in August and September, Strelnikov was a part of the roster for Team Iron.

[31] In December 2021, at the 2021 World Short Course Championships held at Etihad Arena in Abu Dhabi, United Arab Emirates, Strelnikov swam the breaststroke leg of the 4×50 metre mixed medley relay in the final, splitting a 26.02 to help achieve a fourth-place finish in 1:37.44.

[33][34][35][36][37] Concluding racing at the Championships with the 50 metre breaststroke, he placed tenth in the semifinals with a time of 26.33 seconds.

[38] As part of a reactionary ban enacted by the Court of Arbitration for Sport following accusations of widespread doping in Russia and spanning 17 December 2020 to 16 December 2022, the Russian team, including Strelnikov, competed using the name Russian Swimming Federation at the World Championships.

[42] Over one month later, on 21 April 2022, the world aquatic sport governing body, FINA, also shut down his opportunity to grow his racing experience at their competitions, banning him and all other Russians and Belarusians through at least the end of the year.

[46] In the semifinals of the 100 metre breaststroke on the first day of the 2023 Russian National Championships in April in Kazan, Strelnikov received a b-classification with a time of 1:01.03 and overall ranking of tenth.

[47] He ranked fourth in the morning preliminaries of the 50 metre breaststroke on the fifth day with a 27.19 and qualified for the evening semifinals.