The migration crisis is the main topic of today's talks between Bulgarian Prime Minister Boyko Borissov and German Chancellor Angela Merkel. The Bulgarian Prime Minister has arrived in Berlin from Istanbul, where he met Turkish President Recep Tayyip Erdogan. Turkish leaders had voiced warnings that Europe may face a new wave of migrants if there was no easing of the EU visa regime for Turkish citizens by October. PM Borissov, in turn, called on all EU countries, including the Visegrad Four, to show solidarity in tackling migration flows. The talks in Berlin also involve the prime ministers of Croatia, Slovenia and the Chancellor of Austria.