Erdogan's family involved in purchasing oil sold on the black market by ISIS
Turkey has a long history of playing the middleman to both sovereign and rogue agencies, and profiting on the racketeering that comes from the buying and selling of illegal items. We know that Turkey played a key role in the Iranian oil for gold program that went on for years under the auspices of U.S. imposed sanctions, and Turkey played both sides of the fence by jawboning their support for NATO policies while at the same time making agreements with Russia and Iran for energy and profit.
However, when it comes to ISIS Turkey went way beyond simply buying oil from them on the cheap, and instead played a role as a wholesaler who sold that oil back into the market for great profits. And the individual at the center of this oil trade was President Erdogan's own son, Bilal.
Turkey's role in facilitating the sale of Islamic State oil has been the subject of some debate for quite a while. From "NATO is harbouring the Islamic State: Why France’s brave new war on ISIS is a sick joke, and an insult to the victims of the Paris attacks", by Nafeez Ahmed:
"Turkey has played a key role in facilitating the life-blood of ISIS’ expansion: black market oil sales. Senior political and intelligence sources in Turkey and Iraq confirm that Turkish authorities have actively facilitated ISIS oil sales through the country. Last summer, Mehmet Ali Ediboglu, an MP from the main opposition, the Republican People’s Party, estimated the quantity of ISIS oil sales in Turkey at about $800 million—that was over a year ago. By now, this implies that Turkey has facilitated over $1 billion worth of black market ISIS oil sales to date” - Medium
And of an interesting side note, before Turkey shot down Russia's aircraft last week, Putin blew up a convoy of oil tankers that were on their way to Turkey.
Neocon's behind the attack on the Russian plane: Victoria Nuland in Turkey one month before the attack
As we know from the Maidan coup that took place in Kiev a few years back, wherever U.S. Assistant Secretary of State Victoria Nuland goes, death and U.S. foreign policy follows. And with Secretary Nuland visiting Ankara in late October, chances are highly possible that Erdogan was given instructions on harassing Russia along its border with Syria, and creating an event where NATO would have to declare war against Putin under Article 5 of their defense agreement.
To add some credence to this theory, all one needs to do is look at the headlines on the Wall Street Journal which called President Putin a 'Paper Tiger', and tried to provoke him into attack Turkey so that NATO would have justification to save them as a NATO member.
U.S. wants to provoke Russia into using their C3 electronic jamming technology so that the Pentagon can attempt to find a way to counter it
One of the more interesting theories on why Turkey shot down a Russian aircraft came to Dr. Roberts from a former Air Force confidante who suggested that after Russia electronically shut down the U.S.S. Donald Cook last year in the Black Sea, that the Pentagon is desperate to find a way to counteract this technology and believes that if Russia is forced to expand the war beyond ISIS, then they will need to utilize their jamming capabilities and open themselves up to potential 'intercept'.
Either way, the blowback from Turkey's actions have had a chilling effect on both Europe, and Ankara as Putin has chosen the path of economic sanctions and legal expansion of military might along the Turkish border with Syria. And with NATO already proclaiming that Turkey's attack negates the use of Article 5 since they were the aggressors against Russia and not the opposite, the end result no matter which theory(s) are proven correct is that this sacrificing of a pawn has now allowed Russia to move without a single word from Europe or the United States onto much greater areas of the chessboard, and with much more firepower than they intended previously.