The US has recently announced that it is “securing” oil-fields in Northern Syria.
This is the US President:
But we are leaving soldiers to secure the oil. And we might have to fight for the oil. It’s ok. Maybe somebody else wants the oil, in which case they have a hell of a fight.
[…] What I intend to do perhaps is make a deal with ExxonMobil or one of our great companies to go in there and do it properly. 
Syria is not (at least in legal terms) a province or property of the US. But this is how the US is treating it. Trump may be more outspoken than his predecessor, Barack Obama, but this is not a change in US policy. In the wake of the illegal invasion of Iraq US oil companies moved in and signed large contracts with the government put in place by the US. (‘Legitimized’ by an election of course). 
So Trump is simply doing in Syria what the US has already done in Iraq. Invade an oil-rich country from which their oil companies were excluded in order to get their oil businesses in. Prior to the ‘civil’ war in Syria in 2011 there was some involvement in Syria’s oil industry by European firms. The firms withdrew because of EU and US sanctions on Syria.  Now the US is, apparently, back. This time they don’t need to ask permission of the government of Syria or sign a contract because they are armed to the teeth. Much more convenient. Banditry pure and simple.
This should be the leading headline in all the Western press. The leader of the “free” world openly declares a policy of international banitry. Why isn’t it? Because it isn’t news. Everyone actually knows that the Western powers engage in international banditry (imperialism). Everyone knows that when they attack and invade Iraq, Libya, Syria…. it is not for humanitarian reasons. But the press plays the crucial role of dressing up all this banditry as humanitarian intervention so that the leaders can keep the narrative about ‘democracy’ on which their regimes are based alive a little bit longer.
The Western presence in Syria, illegal under international law, has been sold – by a 100% stooge-like press – to the populations of the West in terms of “human rights” and saving civilians against the “butcher” Assad. But the reality is in this oil grab on behalf of Western finance capital and energy businesses.