Osama Abu Zaid, a spokesman for the Free Syrian Army rebel alliance, shows the text of the agreement about a cease-fire between Syrian opposition groups and the Syrian government during a news conference in Ankara, Turkey, Dec. 29, 2016. Much remains unclear about the nationwide Syrian cease-fire Russian President Vladimir Putin announced Thursday – a truce that Moscow says can pave the way for Russian-brokered talks on a settlement of the five-year-long war.