President's spokesperson Ibrahim Kalın said on Friday that Washington told Turkey that it will participate in fresh Syria peace talks being organized by Ankara and Moscow this month but the level of its participation is unclear.

Axar.az reports that, speaking with foreign correspondents in Ankara, Kalın said Turkey, Russia and Iran share three principles for the talks which are an end to the fighting, protecting Syria's territorial integrity and cleaning terrorists from Syrian soil.

On Thursday, Foreign Minister Mevlüt Çavuşoğlu, said that US officials would be invited to the January 23 peace talks in the Kazakh capital.

"The United States should definitely be invited, and that is what we agreed with Russia," he said.

"Nobody can ignore the role of the United States. And this is a principled position by Turkey," he added.

In the past, Washington has played a key role in attempts to bring Syria's warring parties to the negotiating table, but it has been notably absent from the cooperation between Ankara and Moscow.​

A source close to the Assad regime said it expected the meeting to open with a session including all the invited parties but most of the discussions would take place directly between the regime and opposition under Russian and Turkish supervision.