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The leaders of Bosnia, Serbia and Croatia are meeting on the sidelines of a trade fair in Bosnia to try to improve their relations, recently strained by harsh words exchanged over war crimes committed during their conflicts in the 1990s and Croatia's veto on Serbia's EU talks.

At the opening of the fair in the southern city of Mostar on Tuesday, the leaders spoke of strengthening economic ties and their joint future in the EU, of which Croatia is already a member.

They said they had constructive bilateral talks that they intend to intensify.

The three fought brutal wars two decades ago after the disintegration of Yugoslavia, of which all three were formerly part.