Christian Horner has praised Sebastian Vettel for a "remarkably mature" reaction to the problems he has been facing so far this year.

The reigning world champion has been beset with reliability issues on top of the performance deficit of the Renault power unit compared to Mercedes, all of which has left him 105 points behind Nico Rosberg in the standings. However, while Horner publicly criticised Renault after the Austrian Grand Prix he says he has been impressed with Vettel's response to the situation.

"He's been remarkably mature about it, to be honest with you," Horner said. "Not shallow in any way, not spitting out his dummy or throwing the toys out, and he's had the majority of the problems this year.

"He recognises he has enjoyed a lot of success with Renault power, and now isn't the time to be giving them a particularly hard time. Obviously he wants to be running at the front, he doesn't want to be retiring from grands prix, or experiencing the problems he's been having.

"What we need with Sebastian is a clean weekend - Friday, Saturday, Sunday where he is able to get the most out of the car and engine package."

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And asked if Vettel had written off his hopes of winning a fifth consecutive drivers' championship, Horner said the title was still the aim.

"No, not at all. We're not even halfway yet. He's written off nothing yet. There's still a long way to go."