Turkey and the U.S. are discussing options for a joint operation to retake Daesh's so-called capital of Raqqa, a photo released by the Turkish military has revealed.

Turkish military Chief of Staff Gen. Hulusi Akar met with his counterparts U.S. Gen. Joseph Dunford and Russian Gen. Valery Gerasimov in the southern city of Antalya on Tuesday.

The Turkish military released photos of the meeting, and in one of the photos, a document can be seen in front of a Turkish general with the title "Raqqa Offensive: Turkey-U.S. joint planning."

The photo revealed that Ankara and Washington are currently evaluating options to draw up a joint plan for the Raqqa offensive.

A statement released by the Turkish Armed Forces (TSK) said the meeting between generals focused on discussions mainly regarding developments in Syria and Iraq.

A U.S. commander of the anti-Daesh coalition told reporters last week that military leaders are still discussing Turkey's participation in the Raqqa operation, and that a decision is yet to be made on whether to include the Syrian Democratic Forces (SDF) led by the PKK's Syrian offshoot the Democratic Union Party's (PYD) armed wing, the YPG in the offensive.

Ankara strictly opposes any involvement of the PYD/YPG in the Raqqa operation, as Turkey considers it a terrorist group. Ankara has suggested that the Free Syrian Army (FSA), which has successfully liberated Jarablus, Dabiq and al-Bab as part of Turkey-backed Operation Euphrates Shield, lead the operation in cooperation with the Turkish military.

The YPG, under the guise of the SDF, is on its way to Raqqa. In fact, according to sources close to the YPG, the terrorist group is positioned only a few kilometers away from Raqqa, a Syrian city on the northeast bank of the Euphrates River.

Ankara has claimed that several thousand FSA fighters were ready to engage against Daesh to liberate Raqqa.

The meeting of the three generals, the first of its kind, came at a time when options for an operation against the Daesh terror group's de-facto capital Raqqa and Syria needed to be discussed. While Ankara and Washington are making attempts to create a joint Raqqa plan, the Kremlin also attended the meeting to voice its views.