By Tulay Karadeniz and Tom Miles GENEVA (Reuters) - Talks to hammer out a new security deal for Cyprus have showed encouraging results, United Nations Secretary-General Antonio Guterres said on Thursday, but he cautioned against any expectations of a quick fix. Cyprus was split by a Turkish invasion in 1974 that followed a brief coup engineered by the military then ruling Greece. Flanked by Greek Cypriot leader Nicos Anastasiades and Turkish Cypriot leader Mustafa Akinci, Guterres said he believed Cyprus could be a "symbol of hope" at a time the world faced so many disasters.