Hungary has blocked €50bn ($55bn; £43bn) in EU aid for Ukraine - just hours after an agreement was reached on starting membership talks.
"Summary of the nightshift: veto for the extra money to Ukraine," Hungarian Prime Minister Viktor Orban said after Thursday's talks in Brussels.
EU leaders said the aid negotiations would resume early next year.
The aid blocking was announced by Mr Orban shortly after the EU leaders decided to open membership talks with Ukraine and Moldova and to grant candidate status to Georgia.
Hungary - which maintains close ties with Russia - has long opposed membership for Ukraine but did not veto that move.
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