Twelve years after it first supplied Red Bull with engines, Renault believes the time will be right to split with the championship-winning Formula One team at the end of the year.
Red Bull has signed a new two-year contract with Honda from 2019 that will bring an end to a successful but uneasy relationship with Renault, which accounts for all four of the team's titles and 47 grands prix victories but has also come under strain in recent years.
Renault's struggle to match the power outputs of class leaders Mercedes and Ferrari since the start of the turbo-hybrid era in 2014 has led to very public disputes with Red Bull over the performance of its engine in recent seasons.