firn---this whole trend was triggered by the almost unannounced Strategic l Reserve oil sale of 6m barrels months ago shortly after the Crimea annexation--that was when the price started to move.
Still not sure if in fact the KSA moves are targeting the US due to their coming online with light crude out of fracking which I doubt as the US crude from fracking is a very good quality light crude somewhere above WTI and under Brent or truly targeted against Iran their regional hegemon competitor and Russia for supporting both Iran and Assad.
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