Red Bull driver Daniel Ricciardo has called on Formula 1 to introduce closed cockpits following the deaths of French F1 driver Jules Bianchi and British IndyCar racer Justin Wilson. (Mirror) 
Red Bull team principal Christian Horner says his team may not go ahead with Renault's engine upgrade for the Russian Grand Prix because they still need to decide whether it is worth taking a penalty for. (Crash.net)  
 
And Red Bull adviser Helmut Marko hopes Mercedes come to regret not supplying the team with new engines. Mercedes chose to turn down a tie-up with Red Bull, who are evaluating their options before an imminent split with Renault. (SpeedWeek, via Motorsport) 

 
Williams' chief technical officer Pat Symonds says the British team are just 1% away from the level of performance they need to start picking up wins this season. (Formula1.com) 
 
Pirelli has announced its tyre compound nominations for the next three Grands Prix of the season. (Sky Sports) 
British driver Lewis Hamilton posed for a photo with pop singer Sam Smith at Tuesday's GQ awards. (Lewis Hamilton Twitter)