Russia formed seven round-the-clock humanitarian corridors across Aleppo this month to allow safe passage for civilians and militants wishing to lay down arms.
Syria has been mired in civil war since 2011, with government forces loyal to President Bashar Assad fighting a number of opposition factions and extremist groups. On February 27, a US-Russia brokered ceasefire came into force in Syria. Terrorist groups such as Daesh, as well as Jabhat Fatah al Sham (formerly known as Jabhat al-Nusra, or Nusra Front) are not part of the deal. Both groups are banned in Russia and a range of other countries.