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In this photo taken Thursday, June 29, 2017, a worker inspects roll of coiled steel plate into barge, in the city of Smederevo, 45 In this photo taken Thursday, June 29, 2017, a general view of the Zelezara Smederevo steel mill, in the city of Smederevo, 45 kil In this photo taken Thursday, June 29, 2017, a worker inspects rolls of coiled steel plate into barge, in the city of Smederevo, 4 In this photo taken Thursday, June 29, 2017, workers unload a rail wagon loaded with coils of steel panels, in the city of Smedere In this photo taken Thursday, June 29, 2017, a worker inspects rolls of coiled steel plate into barge, in the city of Smederevo, 4 In this photo taken Thursday, June 29, 2017, workers rest near billboard showing Chinese President Xi Jinping, reading: "Welc