A Russian serviceman releases a "Tachyon" reconnaissance drone aircraft during the joint Russian, Belarusian and Serbian military exercise "The Slavic Brotherhood 2016" at military airport Kovin, Serbia on Nov. 7, 2016. Russia, Belarus and Serbia start Monday a joint international military exercise under the name "The Slavic Brotherhood 2016". The drill will last until Nov. 9. (Xinhua/Predrag Milosavljevic)