Mercedes team boss Ross Brawn has questioned the decision of rival teams to quit the Formula One Teams' Association - arguing that the grid would have been better served by everyone retaining a united focus.

Continued arguments about the Resource Restriction Agreement which teams adhere to saw Red Bull, Ferrari, Sauber and Toro Rosso all elect to quit the organisation, with HRT having already quit earlier in the year after stating that FOTA didn't serve its needs.

However, Brawn insists that the upcoming negotiations of a new Concorde Agreement to help govern the future of F1 would have been easier if all teams were working together and said it was a short-sighted decision from those teams who had quit FOTA.

"We are very committed to FOTA and we think it's a great shame that we've lost the members from FOTA because I think we may live to regret that," he was quoted by ESPNF1. "I think when there was a crisis and outside pressure it pushed FOTA together, now that there's not so much outside pressure the natural competitiveness of the teams is pushing us apart a bit.

"But I think we are very short-sighted in not recognising that FOTA has a very important role to play. I think it is an unfortunate feature of Formula One that we all find it fairly difficult to come together. I'm a great believer in FOTA but I'm disappointed, obviously, with what has happened in the last few months. I think we're going to regret it in Formula One because one of the objectives of FOTA was to find the right solutions for Formula One, not just the right solutions for an individual team."

Brawn added that the arguments over the RRA shouldn't be used to detract from the importance of the agreement if F1 is to make progress in the coming seasons.

"The RRA is very important," he said. "We've got to find some means of restraining the costs overall and technical regulations and formal regulations will only go part way. The concept of RRA is very important, but it does need everyone to commit to it and work together to find the best solution to having an RRA system. We are committed to it and we are going to persevere to try and make sure it is applied properly and it's viable for the future of Formula One. I think without it we are at high risk."