Renault admits it is considering leaving Formula 1, prompting Red Bull to suggest it could do likewise if its engine partner pulled out of the world championship.
Tensions over Renault's F1 plans were already high as it pondered whether it should create its own works outfit again.
Red Bull team boss Christian Horner also complained that the French firm's engine programme was in a "bit of a mess" following a poor Australian Grand Prix display.
Renault's motorsport chief Cyril Abiteboul had initially insisted that the company had no intention of leaving F1, but he changed his stance on Friday in an FIA press conference.
Speaking while sat between Horner and fellow Renault-powered F1 team chief Franz Tost of Toro Rosso, Abiteboul said a complete exit could be on the cards.
"I can confirm that we are looking at a lot of options, including getting out of Formula 1," said Abiteboul.
"Honestly, if Formula 1 is that bad for Renault's reputation, if we see that we struggle with the current formula, if Formula 1 is not delivering the value that it costs Renault bearing in mind that when you have an engine supplier, you have no financial incentive to develop and fund engine development, then this is what we're looking at.
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