In the fresh bid to give Syria's peace efforts a breath of life, the new international envoy will head to the country in the next few days. Lahdar Brahimi admits his mission has deep challenges, with fighting on the ground reaching fresh levels of cruelty every day. Most recently, activists linked to the opposition have confirmed the rebels executed at least twenty pro-government soldiers last week in the flashpoint city of Aleppo. The men had been bound and blindfolded before being killed. But, as Tesa Arcilla reports, peace attempts in Syria are further undermined by foreign powers taking sides.