Syrian civil defence workers inspecting ruined buildings after regime air strikes in the city in August.

Syrian civil defence workers inspecting ruined buildings after regime air strikes in the city in August.Credit:Aleppo Media Center via AP

For Ankara,the Assad regime's fall was desirable - provided someone else did the actual fighting. But Bashar al-Assad's survival,while troubling,did not rise to the level of a worst-case scenario. As Turkish President Recep Tayyip Erdogan has shown withhis Russian counterpart Vladimir Putin andIsraeli Prime Minister Benjamin Netanyahu,even the most damaged diplomatic relationship is not beyond repair.

For Ankara,the worst-case scenario began to take shape in early August,when a US-backed,Kurdish-led force managed toliberate the Syrian town of Manbij from Islamic State. The nightmare of the Turkish government and military has always been that Syria's entire northern border would be held by Kurdish militia.

Those who say that Turkey has been waiting for an excuse to intervene are deluded. When a tiny sliver of Turkish heritage in the north of Syria came under threat,Turkey had an excuse. Instead itstole into Syria,rescued the remains of its national hero and stole back across the border before the Syrian regime could even email a complaint to the UN.

Before that there was thehumanitarian crisis at Kobane,where a town full of Kurds was overrun by IS as the world stood by. Fairfax correspondent Ruth Pollard travelled to that frontier and watched as Turkish troops,less than a kilometre from the fighting,beat and gassed Kurdish protesters on their side of the border,their backs turned to Syria.

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An August 2015 front page from Australia's Arabic-language<i>El-Telegraph</i>newspaper with the headline"the safe zone in northern Syria is near ... and forbidden to the Kurds and Nusra".

An August 2015 front page from Australia's Arabic-languageEl-Telegraph newspaper with the headline "the safe zone in northern Syria is near ... and forbidden to the Kurds and Nusra".Credit:Maher Mughrabi

But the idea of a contiguous Kurdish proto-state sitting right next to Turkey's restive south-east - itself a hotbed of Kurdish separatism - was too much to bear. Finallya finger of the Turkish military machine was placed in the jaws of the conflict,hoping to keep Kurdish troops from advancing west of the Euphrates River.

Turkeycampaigned for a long time to have a"safe zone"created in Syria's north,by which it meant a place that was off-limits to Assad's air strikes and Kurdish forces,to no avail. So now it has effectively taken the task upon itself. But for how long? And with what aim?

A Turkish army tank stationed near the Syrian border in Suruc earlier this month.

A Turkish army tank stationed near the Syrian border in Suruc earlier this month.Credit:AP

If there is not a wider ceasefire,there is no way that Turkey can hope to repatriate any of the millions of Syrians currently taking refuge in Turkey. What is more,if Turkish forces advance much further they will find themselves on the doorstep of Aleppo,a major Syrian city which - like Kobane before it but on a much larger scale - is in the grip ofa humanitarian crisis.

Will they once again turn their back and pretend that this is nothing to do with them? If so,then Mr Erdogan's claims to be moved by the suffering of Syria's people will be exposed - and the possibility of a rapprochement with Dr Assad will move a step closer.

A Kurdish man holds up a picture of PKK leader Abdullah Ocalan in Diyarbakir,Turkey,in March 2015.

A Kurdish man holds up a picture of PKK leader Abdullah Ocalan in Diyarbakir,Turkey,in March 2015.Credit:Getty Images

If the possibility of such a deal is Turkey's dirty little secret,then in Hangzhou on Monday the Pentagon's dirty little secret came close to the surface.

Russia's main sticking point at the latest meeting with US Secretary of State John Kerry was what it calls"separation of forces"- the need for the US to create"a real,genuine demarcation between terrorists and the so-called opposition",as Russian Deputy Foreign Minister Sergei Ryabkov put it.

Footage supplied by the Free Syrian Army's Fursan al-Haq Brigade shows the moment of a US-supplied TOW missile's impact.

Footage supplied by the Free Syrian Army's Fursan al-Haq Brigade shows the moment of a US-supplied TOW missile's impact.

In US media,the same distinction is made between"good rebels"and"bad rebels",with the understanding that while the Free Syrian Army are to be supported,Islamic State,theal-Qaeda-affiliated Nusra Front and other jihadist elements are beyond the pale.

But as Moscow knows only too well,on the ground this distinction is nonsense. Even within the Free Syrian Army,units such as Fursan al-Haq (the Knights of Truth),whichthe CIA supplied with TOW anti-tank missiles to some effect earlier in the war,use religious language and imagery in their propaganda that would send your average American voter straight to the Department of Homeland Security.

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The rebellion against the Assad regime is just like the politics of the wider Middle East - it has an Islamist component that can't be excluded or wished away. And so Washington can't meet Moscow's"reasonable"request,and so the war grinds on,chewing up and spitting out the lives of millions of Syrians while everyone washes their hands,says they have done the best they could and boards the next plane to the next summit meeting.

Maher Mughrabi is the Foreign Editor ofThe Age andThe Sydney Morning Herald.

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