Mother Agnes-Mariam from the monastery of St James the Mutilated in Syria's Homs province said she could not fathom why the international community is "gambling with the names" of terror groups, namely Jabhat al-Nusra.
The mother superior, who has been involved in the Mussahala (Reconciliation) initiative in Syria, told state-backed RT (Moscow offices pictured below) the al-Qaeda offshoot "changes its name and it becomes a moderate rebel [group].
"Western and Arab powers are helping Jabhat al-Nusra as being the sole rebel power to be strong enough to stand facing the Syrian Arab Army.
"And all this is threatening the lives of millions of people. I don't think that the opposition will end up in power because they're...totally divided among them."
The peace campaigner, who has reportedly been supporting all sides of the conflicts, said her humanitarian efforts in Aleppo had been "demonised" by the Western media who "don't care about any good we're doing".
Having appeared multiple times on RT, Mother Agnes-Mariam has been branded by a Buzzfeed reporter in 2013 as "a kind of unofficial spokesperson for the Assad regime" and "the Syrian equivalent of one of Hitler's brown priests".
In a statement to Premier a Foreign Office spokesman said: "The UK and its partners do not give any support to the Al Nusra front, now known as Jabhat Fatah al-Sham.
"On the contrary, that group is proscribed both by the UK domestically and by the United Nations as a terrorist organisation. We therefore strongly oppose it and work to combat its influence."