Russian Foreign Minister Sergei Lavrov on Tuesday said there should be no "concessions to terrorists" at talks with his Turkish counterpart on Syria, a day after Moscow's ambassador was murdered in Ankara.

Lavrov told Turkey's Mevlut Cavusoglu at a meeting in Moscow that the killing of envoy Andrei Karlov "forces all of us to fight more decisively against terrorism" and push to achieve concrete results at three-way talks with Iran on Syria "without allowing any concessions to terrorists".