[1][3] During the 2016–17 season, his third with Khabarovsk, Zub contributed with 9 points in 32 games before he was traded to a powerhouse club SKA Saint Petersburg on 1 December 2016.

[5] In his final season with SKA Saint Petersburg, Zub set career highs in the KHL with 13 goals and 22 points in 57 games.

[6] Zub's play in the KHL and the Olympics attracted the attention of the National Hockey League (NHL)'s Ottawa Senators.

[13] On 2 December Zub suffered a broken jaw after being struck in the face by a puck in a 3–2 win over the New York Rangers.

[16] Then on 14 January 2023, Zub sustained a lower body injury versus the Colorado Avalanche after blocking a shot.