The 25-year-old forward led SKA St. Petersburg of the Kontinental Hockey League with 38 points (11 goals, 27 assists) in 45 games this season and scored eight points (one goal, seven assists) in 11 playoff games.
In seven KHL seasons, Tkachyov scored 185 points (62 goals, 123 assists) in 254 games with SKA St. Petersburg, Ufa Salavat Yulayev, Vladivostok Admiral and Omsk Avangard.
He played two seasons in the Quebec Major Junior Hockey League from 2013-15, scoring 79 points (26 goals, 53 assists) in 66 regular-season games with Moncton and Quebec, and 25 points (13 goals, 12 assists) in 27 playoff games.
Tkachyov, then known as Vladimir Tkachev, signed a three-year, entry-level contract with the Edmonton Oilers in September 2014, but it was ruled ineligible by the NHL because he had not yet played a full season for a team in North America.
Tkachev had three assists in three preseason games with the Oilers.
The Kings (21-28-7) were sixth in the eight-team Honda West Division and failed to qualify for the Stanley Cup Playoffs for a third straight season.
