The 21-year-old midfielder, who spent time on loan at Forfar Athletic in 2017/18, could make his debut against League 1 leaders Arbroath on Saturday.
Warriors boss Colin McMenamin told the club website: “Russell is a box-to-box midfielder who will offer energy and the ability to win the ball back. He did well on loan at Forfar last season and was also captain of the Ross County team that won the SPFL U20 League in 2016-17.”