A Bulgarian air force MI-24 combat helicopter strikes during a military exercise at the military base near village of Koren, some 160 km south from Sofia on September 27, 2001. Bulgaria, which borders the Black Sea, Romania, Yugoslavia, Macedonia, Greece and Turkey, NATO's most eastern member, is hoping to receive an invitation to join NATO at the alliance's summit planned for November 2002 in Prague. REUTERS/Oleg Popov
