It has been outlined by independent journalists that Turkey has been aiding ISIS in various conflicts around Turkish border region. There was video smuggled out of Turkey which showed ISIS members meeting with Turkish Police.
An American journalist, Serena Shim, who reported on the Turks aid for the Islamic Terror State, was mysteriously killed soon after outlining a very similar story.
At each occurrence the official position of Turkey and Recep Erdogan is that they have NOT aided ISIS, despite the numerous and frequent accusations of the Kurds who have outlined the support.
Now things take an even more serious shift as solid evidence now proves the Turkish military in direct conversation with ISIS, providing them weapons, and engaging in military conflict against the Syrian Army to the benefit of Ansar al-Islam, a factional Islamic Group within ISIS.

In both March and June of 2014, secretly recorded phone conversation prove the Syrian army provided both anti-aircraft support and artillery bombardments for an alliance of Jihadist groups fighting the Syrian army around Kasab.
The recordings come as a result of a court case within Turkey:

USNWR […]  During the trial of the Islamic State (IS) militants who attacked Turkish security forces at Nigde last year, court files revealed that Turkey, beyond supplying opposition forces with weapons and ammunition, had also given artillery support to the opposition groups that captured Kassab. The prosecutor obtained striking admissions by tapping the defendants’ phones. According to documents obtained by Ahmet Sik of Cumhuriyet, the wiretapping transcripts reveal that the opposition forces at Kassab inform people in Turkey of the coordinates of Syrian army positions around Kassab, and then Turkey shells those locations….   (link)

The controversial court documents, which include secret wiretap transcriptions, also show Turkey directly provided weapons to Ansar al-Islam. Ansar al-Islam is comprised of ideological Kurdish Jihadists, and has strong ties to both al-Qaeda and ISIS. Ansar al-Islam was also one of the groups fighting our U.S. troops during operations in Iraq.
The evidence in the case goes on to highlight how the Turkish Army backed assaults on Kasab – those assaults were primarily carried out by al-Qaeda affiliate al-Nusra, and the Qatar Sponsored Islamic Front.

The U.S. News and World Report has the full details – HERE

People should not be distracted from the reality that Sunni President Erdogan is working diligently to aid his Sunni ideological brethren in ISIS.
As Egypt’s Fattah el-Sisi continues to outline  the regional influence of the extremist Muslim Brotherhood – it becomes even more obvious that Turkey is facilitating ISIS extremists who are in direct alignment with the Brotherhood. Both Qatar and Turkey are financing and aiding ISIS and The Muslim Brotherhood in Syria and beyond.
The regional concern has now extended toward Kuwait, Libya and Jordan.   We began highlighting research back in September of 2014 discussing the theory of why Erdogan was willing to watch Kobane fall to ISIS.  So far every action has solidified that hypothesis, and now evidence continues to mount that Erdogan is working diligently to aid the Islamic Extremists.