Several drivers have criticised Pirelli's 2020 tyres
Formula 1 teams have unanimously rejected the tyres proposed by supplier Pirelli for the 2020 season.
The Italian company had hoped the new design would be a step forward in plans to introduce less sensitive tyres, on which drivers can push and race harder.
Lewis Hamilton won this year's Russian Grand Prix in Sochi
The promoters of the Russian Grand Prix say they are "confident" the race will go ahead despite Russia's four-year ban from all major sporting events.
The World Anti-Doping Agency (Wada) imposed the ban on Monday following the Russian doping scandal.
Several F1 teams had to start from the back of the grid during last season after replacing parts
Formula 1 has relaxed restrictions on engine usage for 2020 meaning drivers could suffer fewer grid penalties.
Drivers will next year be able to use three MGU-Ks - a part of the hybrid system - one more than in 2019.
Lewis Hamilton won just over half the races this season on his way to a sixth F1 championship
Lewis Hamilton dominated the Abu Dhabi Grand Prix to end the season in which he won a sixth world drivers' title on a high.
The Mercedes driver led away from pole position and cruised off into the distance, untroubled by anyone behind.
Formula E: Briton Sam bird wins first Formula E race of season
Britain's Sam Bird won an eventful opening race of the new Formula E season in Saudi Arabia.
The Envision Virgin Racing driver beat Porsche's Andre Lotterer and Mercedes' Stoffel Vandoorne after starting fifth.
