Sebastian Vettel says Red Bull's decision to swap Daniil Kvyat for Max Verstappen was before the Russian crashed into him in Sochi.
Daniil Kvyat has admitted he was "shocked" by his demotion from Red Bull to junior outfit Toro Rosso.
Verstappen? Hamilton? Kvyat? The Sky F1 team on the drivers who are in greatest need of strong performances at Barcelona.
A team-by-team guide for the upgrades, new parts and improvements being introduced this weekend in Barcelona.
Hamilton v Rosberg loses top billing to bad luck, and the Verstappen v Ricciardo fight all eyes will be on this weekend
Sky Sports F1's Mark Hughes on why Ferrari struggled in Russia and why their true pace should be revealed in Barcelona.
Renault will evaluate their B-spec power unit during the two day test which follows the Spanish GP.
Do Verstappen and Kvyat keep their tyre allocations? Do championship points switch across? Some of the key questions answered.
Lewis Hamilton has urged his supporters to 'trust' Mercedes after the F1 world champion suffered a spate of mechanical failures at the start of the new season.
Lewis Hamilton may be one reprimand away from a grid drop, but who is closest to the more severe sanction of a race ban?
Jenson Button has criticised Red Bull's "short memories" after they replaced Daniil Kvyat with Max Verstappen.
Max Verstappen will form a new driver line-up for Red Bull alongside Daniel Ricciardo, replacing Daniil Kvyat from Spain.
Ferrari will take softer tyres to Spain than Mercedes, where teams have appeared reluctant to pick Pirelli's hardest compound.