Krasimir Karakachanov (3rd L), Deputy Prime Minister and Defense Minister of Bulgaria, visits the 13th International Defence Equipment Exhibition "Hemus 2018" in Plovdiv, Bulgaria, May 30, 2018. The 13th International Defence Equipment Exhibition "Hemus 2018" opened on Wednesday in Plovdiv, the second largest city of Bulgaria. (Xinhua/Zhan Xiaoyi)