German Chancellor Angela Merkel (R) leaves after her visit to Anitkabir, the mausoleum of Mustafa Kemal Ataturk, founder of the Republic of Turkey, during her visit to Ankara on February 8, 2016. Merkel is to hold talks with Turkey's President Recep Tayyip Erdogan and Prime Minister Ahmet Davutoglu to press Turkey to strengthen border controls to stem the flow of migrants and refugees heading for Europe.