The European Commission has issued a warning to Serbian President Aleksandar Vucic that his expected visit to Russia for the May 9 Victory Day celebrations could seriously complicate Serbia’s accession process to the European Union. European Commissioner for Enlargement Marta Kos conveyed this message during her recent visit to Belgrade, Caliber.Az reports, citing Russian media. According to European Commission spokesperson Guillaume Mercier, the warning was communicated directly to the Serbian president. “We warned Serbia that a visit to Moscow could complicate the process of negotiations and preparations for joining the EU. We expect Serbia to confirm its strategic priorities,” Mercier...