Red Bull team principal Christian Horner says he and his team were left frustrated by Renault's false promises of progress, which ultimately contributed to their strained relationship which, at one point, looked to be over, before a rekindling of sorts late last year. The Milton Keynes based team enjoyed huge success with Renault, taking four back-to-back drivers' and constructors' championships between 2010 and '13. However with the introduction of a new engine formula in '14, it became apparent that Renault had fallen behind its rivals. Despite that, Red Bull still managed to secure three victories. Renault promised it would bring improvements over the winter, but...
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