(ANSA) - BELGRADE, DEC 11 - "I received a message from Moscow": Serbian President Aleksandar Vučić's outburst during his meeting with EU leaders Ursula von der Leyen and António Costa in Brussels last night caused a stir. Cameras captured Vučić's remarks during the traditional pre-meeting photo opportunity. The Serbian president spoke into an open microphone, and von der Leyen responded, embarrassed, "Let's wait... let's wait until..." without finishing her sentence. During the working dinner, the leaders talked about Belgrade's progress towards EU membership. (ANSA).