Tusk and von der Leyen visited Polish-Belarusian border despite warnings about Belarusian military. PHOTO Polish Prime Minister Donald Tusk said that the security services had advised him and European Commission President Ursula von der Leyen to cancel their visit to the Polish-Belarusian border because of the presence of Belarusian soldiers. 3 766 9 Previously in trend: von der Leyen meets Tusk