Aleksandar Vucic, and Ana Brnabic, Serbia's President and Prime Minister respectively, are said to go to Sremska Raca, a border crossing with Republika Srpska, an entity in Bosnia and Herzegovina to witness the commemoration of the 25th anniversary of the Croatian army and police 'Storm' operation.
Serbia and the Serbs mark the event as a war crime of ethnic cleansing. At the same time, Croatia celebrates the anniversary as the operation as the final step towards the liberation of the country.
On August 4, 1995, Croatia started the offensive to liberate the parts of its territory held by the rebel Serbs for four years.
The 'Storm' operation resulted in up to 250,000 local Serbs fleeing Croatia and many killed during and after the action on the territory then known as the Republic of Srpska Krajina.
The numbers of killed Serbs during and after the operation varies drastically.
According to the Croatian official sources, 214 soldiers and civilians were killed. In contrast, the Serbs' 'Veritas' organisation and the sources from Republika Srpska put the number of dead and missing at nearly 2,000.
In 2001, Croatia's Helsinki Committee for Human Rights confirmed 677 civilian casualties, adding the figure might not be precise.