By Nick Tattersall ISTANBUL (Reuters) - Turkish Prime Minister Tayyip Erdogan on Thursday de**unced as "villai**us" the leaking of a recording of top security officials discussing possible military action in Syria to the video-sharing site YouTube. Erdogan's foreign minister Ahmet Davutoglu called the posting a "declaration of war," an apparent reference to an escalating power struggle between Erdogan and rivals. The posting took the campaign to a higher level, impinging on a highly sensitive top-level meeting of security officials. "They even leaked a national security meeting," Erdogan said at a campaign rally.