U.S. Defense Secretary Jim Mattis speaks at the opening of the 53rd Munich Security Conference in Munich, Germany, February 17, 2017. REUTERS/Michael Dalder
COPENHAGEN (Reuters) - U.S. Defence Secretary Jim Mattis said on Monday the United States would closely examine proposed de-escalation zones aimed at easing Syria's civil war but warned "the devil's in the details" and that much needed to be worked out.
The deal to create "de-escalation" zones in the major areas of conflict in western Syria took effect on Saturday.
