Vitaly Petrov has revealed that he will be wear a black armband during this weekend's Malaysian Grand Prix out of respect for those people killed in two bomb attacks in Moscow earlier this week.

The attacks on Monday saw 39 people lose their lives after suicide bombers struck on two Moscow Metro trains.

"For today and Saturday, I am wearing a black armband to show my respect for the people who were killed or wounded at Lubyanka and Park Kultury stations in Russia this week," Renault ace Petrov said. "My thoughts are with everybody affected by this tragedy."

Petrov was speaking following the Friday practice sessions at Sepang, where he ended the day with the tenth quickest time despite problems in both the morning and the afternoon.

Despite that, the GP2 graduate said he was confident of an improvement compared to last week in Australia even if there is work still to be done.

"The overall balance of the car was good today and it certainly feels like we have made an improvement compared with Melbourne," he said. "Unfortunately I had a problem with the fuel pump this morning and a water leak this afternoon, which cost me some track time. We still have a lot of work to do overnight and tomorrow morning so that I can get the most from the car and qualify well for the race."