Nobuharu Matsushita and Nikita Mazepin escaped serious injury after a huge crash red-flagged the Sochi sprint race in Formula 2.
Both drivers were taken to hospital for precautionary checks after the opening-lap collision.
Mazepin had started from pole, with Matsushita third, but the Russian ran wide at Turn 2 and made contact with the car of Jack Aitken, which sent him skidding back across the track and into the path of Matsushita.
The Japanese driver's car was shunted heavily into the barriers at the entry of Turn 3 and took another impact from Mazepin's car.
The red-flag period lasted more than half an hour as both drivers' condition was assessed and track repairs were carried out.
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