Russia has asked the United Nations to blacklist a major Syrian rebel group that is playing a key role in talks to end the conflict, its ambassador to the UN said.
Mohammed Alloush, a leading figure in Jaish al-Islam (Army of Islam), is the chief negotiator for the High Negotiations Committee (HNC), the war-torn country's main opposition group, at UN-brokered peace talks in Geneva.
"The Russian delegation submitted to the UN Security Council's Counter-Terrorism Committee a request" to add "two organizations: Jaish al-Islam and Ahrar al-Sham," to a blacklist that includes the Islamic State group and Al-Qaeda, Russia 's ambassador to the UN Vitaly Churkin said in a statement Tuesday.
Churkin said that the two groups are "closely linked to terrorist organizations, primarily the Islamic State group and Al-Qaeda."
The groups "both give (the IS and Al-Qaeda) and receive from them financial, material, technical and military support," he said.
Alloush rejected the accusation and said Russia was committing "massacres" with its air and artillery strikes in support of Assad.
"Russia supports it (the regime) with its weapons and airplanes and has committed 167 massacres in my country. The terrorist is the one who commits massacres not the one who defends himself," he told AFP.
An unprecedented ceasefire in February brokered by Moscow and Washington saw Syria's government and non-jihadist rebel groups agree to halt attacks while pursuing peace talks.
However the HNC pulled out last week from the latest round of talks that began on April 13 in frustration over a spike in violence on the ground.
Russian Foreign Minister Sergei Lavrov angrily accused the HNC 's members of throwing "tantrums".
The Saudi-backed Jaish al-Islam rebel group is the most important in Damascus province.
Ahrar al-Sham is among the most powerful Islamist rebel groups in Syria.
Financed by Turkey and Gulf states, it is allied to Al-Nusra Front, Al-Qaeda's Syria affiliate, and fights alongside it around Aleppo and in neighbouring Idlib province.
The Damascus regime has consistently branded all its opponents -- armed or not- "terrorists" since the outbreak of war in 2011.