Saudi Arabia and Russia are increasingly cooperating in the energy sphere, having come together through the onset of Opec/Non-Opec production cuts since January 2017. But when it comes to the lucrative Chinese oil market, the two are engaged in a fierce battle for market share. China looks set to be the largest market for each in 2019 and Saudi Arabia is keen to wrestle back its crown as the dominant supplier.

That both Saudi Arabia and Russia are aggressively targeting China is no surprise...