(ANSA) - BELGRADE, 15 OTT - Sergio Mattarella, the Italian President, has arrived in Ljubljana, Slovenia's capital, to attend the annual meeting of the Arraiolos Group heads of state. The Arraiolos meetings provide an opportunity for the presidents to engage in informal discussions about Europe's future, in light of ongoing geopolitical challenges and the effects of the war in Ukraine on the European Union structure. (ANSA).