These people used to work in Serbia and have paid contributions to the country’s fund for pension and disability insurance (PIO Fond).

Stjepan Mesic
The director of public relations sector of the PIO Fond Jelica Timotijevic says that all of those who had worked for the presidency of the former Yugoslavia, for example – and have later become state officials and politicians in their own countries – have a right to a Serbian pension based on individual agreements between Serbia and the former republics.
Serbia pays retirement payments to a total of approximately 24,000 people in all former Yugoslav states, the daily Vecernji List writes.
November 27, 2010 (The Croatian Times)