Max Verstappen faces a battle to retain his lead in the Formula One world championship standings after being relegated to the back of the grid for the Russian Grand Prix.
Red Bull have opted to install a fourth engine of the season in the Dutchman's car ahead of the race at the Sochi circuit, meaning Verstappen must take a grid penalty.
Verstappen, who leads reigning champion Lewis Hamilton by just five points, had a three-place grid sanction hanging over him following his part in a collision with his Mercedes rival in Italy.
The news is a reprieve for Ferrari's Charles Leclerc, who had been demoted to the rear of the grid after the Scuderia chose to debut a new power unit this weekend.
Verstappen finished second in Russia last year, when Valtteri Bottas took the honours and team-mate Hamilton was third.
The 23-year-old has claimed seven race wins this season, with Hamilton on four.