A second round of peace talks begins, but the two sides fail to even agree on an agenda. Joint Special Envoy Lakhdar Brahimi issues an apology for the talks' failure and steps down in May.
Government "barrel bomb" attacks kill almost 250 civilians in Aleppo.
AbdulIlah al-Bashir al-Noeimi replaces Salim Idris as FSA head.
The US National Intelligence Director James Clapper says the war could become a "perpetual stalemate" with no decisive victory possible by either side.
Turkish military shoots down a Syrian MIG-23; Turkish officials say it entered Turkish airspace.