As European Union leaders meet in Brussels for their quarterly summit, with a goal of securing new financial and political support for Ukraine, one man is holding up both: Prime Minister Viktor Orban of Hungary.

Mr. Orban, who has in the past delayed some E.U. sanctions against Russia and is seen as President Vladimir V. Putin’s closest ally in the bloc, said on Thursday that Ukraine was not ready to start negotiating membership in the alliance. He also said that 50 billion euros, about $52…


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