The victory put CSKA level with the Turks on four points with Lille (on two points) hosting Inter Milan (on three) in the later match. 

Ivory Coast striker Doumbia put the Russians ahead in the 29th minute after being set-up by Vagner Love with a clever back-heel. 

The Brazilian also assisted on the second goal by substitute Aleksandrs Cauna, who scored with a fine volley midway through the second half. 

Doumbia, who scored both of CSKA's goals in a 2-2 draw at Lille in their group opener last month, completed the rout after a great solo effort four minutes from time with his fourth goal in three Champions League matches. 

"Trabzonspor are a good team with good players and their win over Inter Milan did not surprise me at all," Doumbia told reporters. "But tonight we were the better team because we created a lot of chances and scored three goals and also kept our concentration from the first minute to the last." 

TENTATIVE TURKS 

Trabzonspor were only included in the Champions League after Fenerbahce were banned from the competition over a match-fixing scandal in Turkey, but came to Moscow leading the group after a shock 1-0 win over 2010 champions Inter in the San Siro in their opening game. 

However, the visitors, who were missing leading scorer Burak Yilmaz through suspension, looked tentative for most of the match, creating only a handful of chances. 

Brazilian midfielder Alanzinho wasted their best opportunity early in the game with the score at 0-0 after going one-on-one with CSKA keeper Vladimir Gabulov. 

"I think we fully deserved our victory tonight," CSKA coach Leonid Slutsky told Russian television NTV Plus. 

"We controlled the tempo and created most of the chances in the game while they only had one clear chance in the first half. I'm especially pleased because we did not give up a goal in a Champions League match for the first time since holding Arsenal (to a 0-0 draw in London five years ago)." 

His Turkish counterpart, Senol Gunes, remained optimistic. 

"We didn't win but it's not the end of the world. We still have three more games to play," summed up the Trabzonspor coach.