Lavrov stressed the UN Secretariat should provide honest and detailed reports on the implementation of the UN Security Council's resolutions on the fight against IS (the Islamic State terrorist group outlawed in Russia) and other terrorist organizations and their financing.

"They say the PYD will not be invited, but if it is invited we will certainly boycott the Geneva talks", he added.

He specifically shrugged off reports last week claiming that Russia's military intelligence chief had traveled to Damascus to try to persuade Assad to step down.

Mevlut Cavusoglu said Turkey considers the Syrian Kurdish forces "terrorists", accusing them of cooperating with Kurdish rebels who are banned in Turkey.

Staffan de Mistura told reporters he would be sending out invitations to the talks in Geneva on Tuesday.

He said 90 percent of Russian airstrikes in Syria had so far targeted civilians and moderate opposition groups, as well as schools and hospitals.

" We are ready to head towards establishing a visa-free regime, but it would be a little odd if that happened now that we do not have diplomatic relations", he said.

It is impossible to reach a peace agreement in Syria without inviting Kurds to take part in the negotiating process, as it would be "unfair" and "counter-productive", RussianForeign Minister Sergei Lavrov said on January 26.

Russian Federation looks forward to correct the "mistakes of predecessors", referring to Stephen Harper's government, Lavrov said Tuesday.

Earlier in the day, Prime Minister Ahmet Davutoglu said Ankara regarded the Syrian Kurds' attendance at the table as a necessity, when he addressed a meeting of his ruling Justice and Development (AK) Party in Ankara.

The United States has accused Russian Federation of missing Islamic State targets in Syria with one senior U.S. official two weeks ago saying only a third of Russia's air strikes in Syria were targeting Islamic State and its imprecise attacks were forcing the population to flee and fuelling Europe's refugee crisis.