another interesting piece of info comes form the russian article by Roman Kretsul, Yuri Bogdanov and Michael Moshkin November 27, 2015
https://vz.ru/politics/2015/11/27/780683.html
Talking about the oil sold by ISIS, Alexander Frolov says:
“Could it be tracked a year ago, two years ago? …our Western colleagues… accuse Turkey of profiting. I would like to ask: friends, didn’t you really know how it all looked? … Go to the ship-location sites and see, for example, an Ukrainian oil tanker approaching the territory controlled by militants. Do you believe she goes to enjoy the local landscape?”
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It made me think of ukrainian oil tankers, and Ukrainian oil and gas company, which paid big money to the son of a US vice-president, who demanded to fire Ukrainian prosecutor, and the desire of the new US President to investigate the case led to the impeachment proceedings.