Christian Horner has demanded Renault remain focused on improving Red Bull's fortunes until the end of the 2016 Formula One season.
Red Bull must remain Renault's top priority until the end of 2016 even if the French engine supplier opt to run a Formula One team of their own next season, says Christian Horner.
Renault stepped away from running a team in 2012 as they became Lotus F1, however they have continued to supply engines within the sport.
Their relationship with Red Bull has become strained in 2015, though, as reliability issues have seen Daniel Ricciardo and Daniil Kvyat fall behind their rivals on the grid.
Despite the ongoing tensions, team principal Horner is committed to improving their relationship and expects Renault - who have been linked with buying back Lotus - to do the same.
"They have no choice for themselves, they have to turn it around," he Crash.net. "We really need to see a good direction in the second half of the year that will carry a development theme into next year.
"We have a very clear situation with Renault until the end of next year irrelevant to the choices they make next year.
"Renault is aware of that so I think the most fundamental thing for both us and Renault is to address and reduce the deficit to Mercedes and Ferrari power units.
"Whatever they do they need a competitive engine and we have an agreement that clearly states we are the premium team. Whatever they do doesn't really affect us."