There's a lesson for Australia in the Turkish military strikes on Syria: our longstanding alliance with the US may be more fragile than we think.
Consider these comments from Donald Trump a year ago about the Kurdish forces who fought in Syria alongside US troops against ISIS.
"They fought with us, they died with us. We lost tens of thousands of Kurds fighting ISIS. They died for us and with us. They're great people. We don't forget, I don't forget," the US president said.
The Kurds also still guard thousands of ISIS sympathisers in northern Syrian camps.
Yet, the same soldiers who stood side-by-side with the Americans now face an onslaught from a far superior Turkish army who consider the Kurds to be terrorists.
Reports from on the ground say their situation has been made worse because they received next-to no warning of Trump's decision.
But the US withdrawal illustrates how determined Donald Trump is to pursue his "America first" policy and his reluctance for the US to act in its traditional (and expensive) role of world policeman.
His new approach has divided even Trump's own party and raises a warning for Australia.
Military conflict is one of the pillars on which our alliance with the US is built. Australia is the only country that has fought alongside them in every major conflict they've embarked on since World War II.
But if the Kurds can be so readily abandoned because it does not suit Trump's agenda, then how much will that count if Australia needs the US?
Militarily it's unlikely, but trade deals with the US are crucial to our economy.
Let's hope it never gets to that.