Russian Prime Minister Dmitry Medvedev (L) and Bulgarian Prime Minister Boyko Borissov attend a joint press conference 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)