Somalia's President Abdullahi Yusuf Ahmed speaks to Reuters during an interview in his Nairobi residence in this August 21, 2005 file photo. Three wily old soldiers who know each other only too well from years at the heart of conflict and power-play across the Horn of Africa are once again pitting their military wits in the Somalia war. Ethiopian Prime Minister Meles Zenawi, his ally Somali President Abdullahi Yusuf, and their mutual arch-foe -- Somali Islamist leader Sheikh Hassan Dahir Aweys -- are the key players in a flare-up many fear could spread across the region.