The IDU is an organisation gathering parties of the centre and the centre right from around the world. The Croatian Democratic Union (HDZ) has been a member for two years.
Addressing the meeting, PM Sanader said that 15 years after it gained independence Croatia had made great progress, was developing a dynamic market economy and a strong democracy, successfully negotiating admission to the European Union, and preparing for NATO membership.
"Stabilising Southeast Europe is the biggest challenge in Europe at the beginning of this century, and Croatia's position is that the whole Southeast Europe should build its future in the EU and NATO," Sanader said.
By organising meetings like the one in Dubrovnik, Croatia is showing that it is a respectable partner in international politics, Sanader said, adding that the meeting offered an opportunity to strengthen the country's international position and contribute to the political stabilisation of Southeast Europe.