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SOFIA, May 4-- Bulgarian President Rumen Radev called for boosting the development of Danube region on Friday, after a meeting with his Austrian and Romanian counterparts Alexander Van der Bellen and Klaus Iohannis. The dynamic development of the Danube region is a very important factor for the entire European Union (EU), Radev said at a joint press conference after the informal meeting of the three leaders in the town of Ruse. | 
