Daniel Ricciardo said Red Bull's starts this season have been "a bit frustrating" after suffering again in the Russian Grand Prix.

Having lined up in sixth place, Ricciardo found himself pushed back to tenth by the end of the opening lap. While he was able to recover to finish seventh - following Fernando Alonso's Ferrari for the final 25 laps - Ricciardo said the first part of the race proved costly as he also struggled with a blistered tyre.

"The first few laps were pretty hectic and we lost a few places at the start," Ricciardo said. "We will have to have a look at that, it's nearly the end of the season now, but we haven't had many good starts so that's a bit frustrating.

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"Starting the race the tyre was already blistered, it had quite a bit from qualifying, so it wasn't looking too healthy and the first stint made it worse; I could see it starting to come apart, so we had to pit quiet early. Then on the prime the tyre lasted well and we had good pace and could match Alonso, but couldn't get past. Congrats to Mercedes - it's been a dominant season by them, so hats off to them."

Team-mate Sebastian Vettel similarly praised Mercedes after admitting he had endured a relatively uneventful run to eighth place.

"I had a good start and then a tough battle with Daniel, but from then onwards the speed was nothing special, we had the same issues as we had in qualifying," Vettel said. "I was alone for a lot of the race, the beginning was entertaining, but after that it wasn't that busy. Congratulations to Mercedes on the title, they deserve it."