A radical Islamic group that wants to establish a global Muslim superstate is demonstrating in Sydney tonight against the conflict in Syria.

A rally is being held in Lakemba on Tuesday, the same day Russia's ambassador to Turkey was gunned down at an Ankara art gallery in 'revenge' for the turmoil in the besieged city of Aleppo.

Radical group Hizb ut-Tahrir is staging the rally near the mosque in south-west Sydney, despite Andrei Karlov's death at the hands of Ankara police riot squad member Mevlüt Mert Altinta.

Like the 22-year-old murderer, Hizb ut-Tahrir has condemned Russia for the war in Syria.

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