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Russian Prime Minister Dmitry Medvedev (C) lays a wreath at the Tomb of the Unkown Soldier in Sofia, capital of Bulgaria, March 4, 2019. Bulgaria and Russia here on Monday during a visit of Russian Prime Minister Dmitry Medvedev expressed their willingness to further develop bilateral ties on the basis of traditional friendship and a wide range of opportunities. (Xinhua/Zhan Xiaoyi)