President Boris Tadic is to become the first Serbian leader to pay his respects to Croatian victims of a notorious 1991 massacre.

He will visit the town of Vukovar, which was captured after a three-month siege by the Serb-led Yugoslav army.

Mr Tadic will lay wreaths at a memorial commemorating the murder of 260 hospital patients.

He and Croatian President Ivo Josipovic will also go to a graveyard where 18 Serb villagers were killed by Croats.

Croatia has described the event as an attempt to relax relations between the two countries....