I blame Red Bull almost 100%.

Renault made a business decision to spend less money on their F1 engine programme than Mercedes. Red Bull don't like that, but it wasn't Red Bull's money. It was Renault's decision to make.

Red Bull's decisions, on the other hand, just look petulant and stupid. Someone elsewhere described their situation thus: they've jumped out of a plane and are now negotiating to buy a parachute on the way down. Unsurprisingly, the negotiations are not going in their favour.

Their criticism of Renault is nothing new. Even in the V8 era when they were winning, Horner regularly made negative comments about the engines. If you were an engine manufacturer, how keen would you be to supply a team that takes all the credit when they win and blames you when they lose?