UN announces start of Syria peace talks as government troops advance

The United Nations announced the formal start of peace talks for Syria on Monday and urged world powers to push for a ceasefire even as government forces, backed by Russian air strikes, launched their biggest offensive north of Aleppo in a year.

Government troops and allied fighters captured hilly countryside near Aleppo on Monday, putting a key supply route used by opposition forces into firing range, according to the Syrian Observatory for Human Rights monitoring group.