Kimi Raikkonen insists he extracted the best from his Ferrari during the Russian Grand Prix despite finishing more than half a minute adrift of race winner Nico Rosberg in third place.

On a weekend that has seen the Mercedes team dominate from the opening practice session, Raikkonen had no answer to Rosberg or to Lewis Hamilton as he came through the order.

Indeed, though he would get the better of Valtteri Bottas in the Williams to notch up his second podium finish of the season, in doing so lifting himself to third in the standings, Raikkonen accepts Ferrari doesn't have the measure of its main rivals as it stands.

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"The car felt better than over the rest of the weekend but it was still not quick enough to fight with the Mercedes, so we know we have work to be done," he said.

"It's not very easy to pin-point what we need. We know there's a few small things we need to improve. There are some developments coming, but Mercedes has been very fast in the last few years and also this year.

"This was as quick as we could go today and we definitively have work to be done, but I'm quite confident that when we get everything as we want we'll be very strong. Again today we didn't finish with both cars where we deserved it. It has been disappointing but we keep working very hard and I'm sure results will come."