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Mexico City - McLaren oppose partner Honda providing engines to Red Bull because they are not a charity foundation for their F1 rivals, racing director Eric Boullier has said.
Former champions Red Bull and sister team Toro Rosso have yet to find an engine partner for 2016 after their current relationship with Renault broke down.
Engine uncertainty
Mercedes has ruled out stepping in, Ferrari has indicated they are willing to supply Toro Rosso only and Renault has yet to reveal their plans for the sport beyond the end of the 2015 season.
McLaren is currently in an exclusive partnership with Honda and, having endured a nightmare first season troubled by engine problems, do not want another team to step in and benefit from their hard work when things improve.
"Clearly there is an issue in Red Bull which was created by Red Bull, not by anybody else and we are not a charity foundation," said Boullier. "So we are not here to help."
F1's commercial supremo Bernie Ecclestone told reporters in October 2015 that Honda had agreed when they decided to return to the sport that they would be willing to supply two teams in their second year.
However they also agreed separately to McLaren boss Ron Dennis having a veto.
Honda motorsport director Yasuhisa Arai told reporters this week that talks were still ongoing, however.
Arai said: "We have been approached by the team but discussions are ongoing and nothing has been decided. I always say this season: we are always open, so we are in discussions that are ongoing - that's it."