Renault boss Eric Boullier has said the stewards were wrong not to punish Lewis Hamilton after the Englishman weaved several times while battling with Vitaly Petrov during the Malaysian Grand Prix.

The incident occurred early in the race at the Sepang International Circuit when Hamilton was battling his way back up the field and after passing the Russian at the end of lap seven, he moved left and right a number of times on the start-finish straight to keep the rookie behind him.

Under the rules, drivers are only allowed to make one defensive move, and Hamilton was subsequently given a warning by the stewards.

Boullier told Spanish newspaper, AS that the warning was not enough and that he had said as much to the FIA.

"It is very clear that there can only be one defensive change of direction. He did three. It is not correct," Boullier explained.

"A warning was given - and if he had repeated it he would have been sanctioned - but that was not sufficient. In such cases it is necessary to fulfill what is exactly in the regulations."

Renault's post-event press release meanwhile made no mention of the incident, with Boullier merely observing that Petrov had a 'good fight' with Hamilton before being forced out with gearbox issues.