Ukrainian President Volodymyr Zelensky has called on Hungarian Prime Minister Viktor Orbán to justify his opposition to Ukraine’s aspirations to join the EU. During a recent meeting in Argentina, he told Orbán directly that he had no reason to block Ukrainian membership in the EU, Zelensky said on Wednesday during a visit to the Norwegian capital Oslo. He had asked Orbán “to tell me one reason – not three, five, 10 – tell me one reason. I am waiting for an answer,” Zelensky said. Orban, who has friendly ties with Moscow, has threatened to block Kiev’s hopes of an early start to accession talks…