Red Bull’s engine partner, Honda, is to leave Formula 1 at the end of 2021.

The move leaves Red Bull and Alpha Tauri needing to find an engine supplier and the sport with just three engine companies.

Honda said the move was a result of the transformation of the car industry away from internal combustion engines.

They are pursuing “carbon neutrality by 2050” through “future power-unit and energy technologies, including fuel-cell vehicle and battery technologies”.

Red Bull team principal Christian Horner said the shifting focus within the automotive industry has led to Honda’s decision to re-deploy their resources and we understand and respect the reasoning behind this.