A majority of voters vote in support of the country 's entry into the European Union . Croatian leaders signed an accession agreement in December to join the EU . Already a member of NATO , Croatia is now poised to join an EU bloc that includes its neighbors Slovenia and Hungary . Croatia will be the alliance 's 28th member state .
A majority of voters vote in support of the country 's entry into the European Union . Croatian leaders signed an accession agreement in December to join the EU . Croatia will be the alliance 's 28th member state .