Mercedes-Benz chairman Dr Dieter Zetsche has hailed the achievements of the Mercedes AMG F1 team as it comfortably wrapped a second consecutive constructors' title in Russia.

With four rounds of the 2015 season still to go, Lewis Hamilton's win in Sochi helped put Mercedes clear of closest rivals Ferrari to officially seal back-to-back constructors' titles.

The third title win for members of the Brackley-based team - which also prevailed in 2009 in its Brawn guise -, Mercedes' success is demonstrative of its continued success since the change of technical regulations at the start of 2014.

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In that time, Mercedes has clinched 28 wins in 34 races, while Hamilton's ninth success of the season in Russia puts him on the cusp of its second drivers' title too. It is a commanding team effort that has earned the praise of Mercedes chairman Zetsche, who is proud to see the manufacturer widen the stamp of its authority in 2015 against stiff opposition.

"What an incredible moment for Mercedes-Benz! Congratulations to our team in Brackley and Brixworth who have worked so hard to make this achievement possible, winning a second world championship in a row.

"After winning in 2014, we raised the bar again to secure this year's title, and we needed to because our rivals gave us plenty of headaches as they stepped up their performance. The work by our team is the perfect example of what drives Mercedes-Benz forward: the best technology. The most efficient hybrid petrol engine that our company has ever made, world-beating aerodynamics and intelligent design in every part of the W06 Hybrid racing car.

"Most importantly, though, we must not forget the human factor: we have two exceptional sportsmen at the wheel, Lewis and Nico, and a fantastic team behind the scenes, who have delivered 12 wins in 15 races so far this year. Their work has made every employee of Mercedes-Benz a world champion and we are very proud of them."