According to this , based on a RIA Novosti report, Abkhazia has entered the fray in the Kodori Gorge  area, which is at the old cease-fire line and was the site of the last flare-up of Georgian-Abkhaz tensions two years ago. The AP confirms  Abkhaz involvement. Foreign Policy‘s blog reports  the comments that the Abkhaz foreign minister made to Der Spiegel . Abkhazia’s entry into the war may have been unavoidable, but I think that may mean paradoxically that the conflict will take longer to resolve now that a fourth party has joined. It should hasten the end of hostilities by dividing Georgian resources, but it could complicate arranging a cease-fire.