Red Bull team principal Christian Horner has congratulated Mercedes on winning the constructors' championship and says it is clear they have done the "best job" this season.

Mercedes took the title with three races to spare after finishing one-two in the inaugural Russian Grand Prix last weekend, something that officially brought to an end Red Bull's four year reign.

Asked if he was disappointed to see that happen, Horner was realistic in his assessment.

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"We have had a little bit of time to get our heads around it," he joked to reporters at the Sochi Autodrom, "from February in reality."

"In all honesty, Mercedes have done the best job this year - and all that does is motivate you," he continued. "You know how much work goes into winning a championship and to win it four times in a row [as we did in 2010, 2011, 2012 and 2013] is an enormous achievement.

"We have had a disastrous year, but we are still second and we are the only other team to have won a grand prix - and three of them at that this year.

"What we have managed to recover out of this season and the fact that we have managed to take them this far into this year, I think, is very much a result in itself."

"Hopefully as the power units should converge into next season we should be able to give them a much bigger fight," he added.

"Congratulations to them. They have done an excellent campaign to win the constructors' championship and after four years in Milton Keynes that trophy will now move up the road to Brackley."

Meanwhile, Horner said that Daniel Ricciardo and Sebastian Vettel just didn't have the speed in a straight line to do better than seventh and eighth in Sochi.

"It was a fairly uneventful race for us. Tyre degradation was not really a factor; we had a concern with the option tyre with Daniel, which is why we pitted so early, but that was pretty much it," Horner continued.

"Dan got pretty close to [Fernando] Alonso at the end - who looked like he was in trouble on fuel - but we just didn't have the pace on the straights to mount a serious challenge. So both cars home, a reliable race, but it has been a Mercedes engine dominated event."