Singapore: Christian Horner has cast fresh doubt over Red Bull's Formula One future beyond this year as their relationship with engine supplier Renault heads for the scrapheap.
Red Bull, powered by the French manufacturer, won four consecutive driver and constructors' championships between 2010 and 2013, but they have failed to win a race in over a year and have finished on the podium on just two occasions this term.
The British-based team have a contract with Renault for next year, but it appears unlikely their fractured partnership will last beyond this season.
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