Jenson Button says he felt he got the "maximum out of his McLaren" en-route to fourth place in the inaugural Russian Grand Prix.

Button looked like he might be on for a podium after Nico Rosberg made an error at the start and had to stop for new tyres.

However with Rosberg recovering and re-taking second later on, Button found himself demoted to fourth and behind the Williams of Valtteri Bottas, finishing 12.8 seconds back at the chequered flag.

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"Not a bad day at all," Button reflected. "I think we got the maximum out of the car and that is the main thing. It was a strange race in that you could do so many laps on a [single] set of tyres. The prime set for me felt like it could go on forever.

"It was back to old school racing if you like in that respect, which I suppose is good in some ways, but it does just mean the quickest car wins."

"It has been a tough year for us," he continued. "But the last few races have improved in terms of results. However when you finish fourth - and it is the best result we have had for a little while - you still want more. You are disappointed because you want to be on the podium and then you are disappointed because you want to win.

"It is though good for the whole team [to be fourth with myself and fifth with Kevin Magnussen].

"I think we did everything right."

Asked if he had any dramas during the 53-lap race at the Sochi Autodrom, Button replied: "I had a little scare on lap 1 in Turn 3 with Fernando [Alonso]. We got very close. But apart from that it was pretty straightforward."

So has McLaren made a genuine step forward or is it just circuit related?

"Some of it is the circuit," continued the 2009 F1 World Champion. "But also I think we have improved the set-up of the car. We have also found some other things that have worked for us. A bit of both really.

"We will see when we get to Austin. I look forward to seeing where we stand.

"The tarmac is very similar to here in Austin, just a lot more traction zones and high speed as well and a bit more mixed too."