OPEC has been doing its defacto pricing in Euros for over ten years, in order to keep crude price-stable in Europe — the EU being a nearby large market, and the USSR, oops, I mean, Russia selling about 45 percent of the EU supply. Since Brexit, the Euro has dropped against the US dollar. It’s just about that, and not about any bugaboos.
http://www.xe.com/currencyconverter/convert/?From=EUR&To=USD
George Soros is probably making money off it...........................