Iran, Russia and Turkey say they will jointly  enforce a fragile three-week cessation of hostilities in Syria.     *The announcement came  two days after the  peace talks in the Kazakh capital, Astana.   In a joint statement, the three countries said there was no military solution to the Syrian conflict.     *It was still not clear whether the Syrian government or the opposition backed the communique. Earlier, a rebel spokesman said "no agreements" would be signed.     *More than 300,000 people have been killed and 11 million others displaced since the so called uprising against President Bashar al-Assad began in March 2011.     *The "trilateral mechanism" was agreed between Russia and Iran, which back Mr Assad's government, and Turkey(NATO) , which supports the opposition.   The two main players in the matter.     *It would " observe and ensure full compliance with the ceasefire, prevent any provocation and determine all modalities" , the statemen...