Ukrainian President Volodymyr Zelenskiy has called for the removal of obstructions that he said continue to disrupt food exports from his country's Black Sea ports. Speaking on January 21 to an international conference of agriculture ministers in Berlin, Zelenskiy also urged participants to support the Black Sea Grain Initiative -- the program that for nearly six months has enabled exports of grain and other foodstuffs through Ukraine's major ports on the sea. "The world needs more determination and more cooperation to stop the aggressions that…