Former UNESCO Director-General Federico Mayor fiercely has opposed the campaign for Kosovo's membership to the organization.

Asked by Radio Television of Serbia how he would vote today in UNESCO on Kosovo's membership, Mayor said he would, without any doubt, vote against it.

Mayor pointed out that while he had served as UNESCO Director-General, from 1987 to 1999, he had five times condemned NATO's military campaign in Kosovo.

He stressed that the UN never has approved the invasion of Kosovo, and that it was possible to reconsider that issue.

Federico Mayor is taking part in a conference on globalization, the migrant crisis and Kosovo's application for membership of UNESCO, organized by the European Centre for Peace and Development in Belgrade.