The capture of Syria's major cities by rebel groups Hayat Tahrir al-Sham and the Syrian National Army, fighting against the forces of President Bashar al-Assad, offers Turkey the opportunity to achieve its strategic goals in the country.
The lightning offensive of Islamist militant group Hayat Tahrir al-Sham (HTS) and the Turkish-backed Syrian National Army, which has seen the rebels capture several major Syrian cities in less than two weeks, gives Turkey's President Recep Tayyip Erdogan leverage over his Syrian counterpart President Bashar al-Assad.
"Turkey can easily stop both [rebel] entities and start a process. Turkey does have this strength, and Assad is well aware of it," said Murat Aslan of the SETA Foundation for Political, Economic and Social Research, a Turkish pro-government think tank.
Until now, Assad has rejected Erdogan's overtures for dialogue to end the civil war peacefully. "The Turkish intention politically is not to escalate in Syria [but to] start a political, diplomatic engagement with the Assad regime, and come to the terms of a normal state, and that all Syrians safely return to their homes," Aslan noted.
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Syrian refugees an issue
Erdogan is seeking to return many of the estimated 4 million Syrian refugees living in Turkey, amid growing public unease over their presence in the country.
"According to the opinion polls here, yes, the Syrian refugees [are] an issue. For any government, it would be a wonderful win to see these Syrians going back to Syria of their own will," explained Aydin Selcen, a former senior Turkish diplomat who served in the region and is now a foreign policy analyst for Turkey's Medyascope news outlet.
However, Moscow has a lot to lose in Syria, as a key military backer of Assad, who in turn has granted Russia use of a key Syrian naval base. "For Moscow, it's of crucial importance that the personality of Assad remains in power," said Zaur Gasimov, a professor of history and a Russia specialist at the University of Bonn.
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Gasimov warns that Turkey could be facing another humanitarian crisis. "Russia would definitely use the military force of its aerospace forces, that can cause a huge number of casualties among civilians. Which means a new wave of migrants towards Turkish eastern Anatolia."
With more than a million Syrian refugees camped just across the Turkish border in the rebel-controlled Syrian Idlib province, analysts warn a new exodus into Turkey is a red line for Ankara.
"If they refresh their attacks on the captured areas by indiscriminate targeting... well [we can] expect further escalations in the region," warned Aslan of the pro-government SETA think tank. "And for sure there is a line that Turkey will not remain as it is, and if there is a development directly threatening the interests or security of Turkey, then Turkey will intervene."
Pushing back the YPG
With the Syrian rebel offensive also making territorial gains against the US-backed Kurdish militant group, the YPG, Ankara is poised to secure another strategic goal in Syria. Ankara accuses the YPG of having ties to the Kurdistan Workers' Party (PKK), which is fighting the Turkish state.
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"Without putting up a fight, and without getting directly involved, they [Ankara] have achieved one of their goals – for YPG to pull back from the Turkish frontier towards the south," explained Selcen. "I think Ankara now is closer to that goal."
With Syrian rebel successes appearing to advance Ankara's goals in Syria, some analysts are urging caution, given the rebels' links to radical Islamist groups. "The crashing down of the Assad regime is not in the interest of Turkey, because there will be chaos," warned international relations professor Huseyin Bagci, of Ankara's Middle East Technical University.
"Who is going to rule? What type of [governing] structure are we going to have?" he asked. "They are radicals, and another Daesh-style territory would not be in the interest of Turkey – in Turkish prisons, there are thousands of Daesh people."
