Allied nations have gained very little. Syria has no oil as all of it has been depleted. Only about 1.5 billion barrel is left which is hard to extract as most of it is in depleted wells. Yemen & Afghanistan are also useless. Lebanon is also useless and is mostly under KSA control, not NATO control. Iraq is either under Iranian or KSA influence. Unlike what you think, there has been a split in relations of KSA & USA as KSA started to consider USA as a thief who steals their oil and gives nothing in return. It became unsustainable for KSA and hence relations have split. So, USA is now having a difficult time. USA increased its oil production despite having low reserves mainly to get independence from KSA & Arabs due to this split.