Four-year-old Rashida from Kobani, Syria
Four-year-old Rashida from Kobani, Syria, part of a new group of more than a thousand immigrants, sleeps as they wait at border line of Macedonia and Greece to enter into Macedonia near Gevgelija railway station August 20, 2015. Thousands of migrants kept up the wait on in a small Macedonian town in the hope of travelling onwards to Western Europe. After days of crowds overwhelming the small station at Gevgelija, Macedonian authorities have established special trains for migrants from south to the northern border with Serbia. REUTERS/Ognen Teofilovski

The Al-Nusra Front, al Qaeda’s Syrian affiliate, has asked extremists in the Caucasus to launch an attack against Russian soldiers and nationals. The move is in retaliation for Russia’s involvement with the Syrian government against the Islamic State group.

Al-Nusra head Abu Mohamed al-Jolani said in an audio message released Monday that the extremists should go for "an eye for an eye." If Russia can kill their soldiers and people, they can also kill Russia’s, he said.

"The war in Syria will make the Russians forget the horrors that they found in Afghanistan," AFP quoted al-Jolani as saying. "They will be shattered, with God's permission, on Syria's doorstep."

According to al-Jolani, attacks against the Russian should stop when the Kremlin stops attacking Syrian village and cities.

"I call on all armed factions to gather the highest number of shells and rockets and to hurl hundreds of rockets every day at the Nusayri (derogatory term apostates) for villages, just like the scoundrels do to the Sunni villages and towns, to make you taste what our people are suffering," he said. "Delay the disputes until the demise and smashing of the Western Crusader and Russian campaign on Syrian land."

Russia started its air campaign against ISIS militants in Syria in September. While al-Jolani warned Moscow to expect ominous consequences for its operation in Syria, two shells have reportedly struck the Russian embassy in Damascus Tuesday.

The strike took place when hundreds of people gathered outside the building to extend their support for the Russian airstrikes. Russian Foreign Minister Sergei Lavrov called the attack "a terrorist act" which, according to the BBC, caused widespread panic and smoke coming from the embassy compound.