Nico Rosberg says he is struggling to find 'satisfaction' from Mercedes clinching the 2015 Formula 1 World Championship constructors' title as he saw his own title hopes all-but-ended in Russia.

The German led away from pole position at the Sochi Autodrom but a throttle pedal issue would strike in the early stages, forcing him to pull into the pits to retire after just five laps - his second DNF in four races.

With main rival and team-mate Lewis Hamilton going on to win for the ninth time this season, Rosberg now faces a 73 point deficit with a maximum of 100 points remaining. It means Hamilton needs to out-score Rosberg by just two points in Austin to officially rule him out of the running.

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It was a result that would ultimately blight Rosberg's mood even after Mercedes was belatedly confirmed as constructors' champions for a second season, though the German insists he will appreciate being a 'world champion' in his own way when he returns to base.

"No, unfortunately [no satisfaction]. It's just a strange way. I'll get it tomorrow when I see we are celebrating with everybody, but it's been a strange day.

"I'm obviously well aware it's a massive team effort and how everybody is. It's a unique job because everybody is in with their heart so much.

"At the end of the day it is still very special to win the constructors', and that's what everybody is working towards. It's awesome to be a part of that. I'm a world champion as well, so that's a small positive."