(CNN) -- On the second day of his planned four-day visit to Turkey and Greece, U.S. Vice President Joe Biden traveled Friday from Ankara to Istanbul, where he is to participate in the Second Global Entrepreneurship Summit, convoked by Turkish Prime Minister Recep Tayyip Erdogan.
The summit is intended "to promote entrepreneurship and facilitate innovation and private enterprise," the White House said in a statement.
While in Istanbul, Biden is to meet with Erdogan and Ecumenical Patriarch Bartholomew, the leader of the global community of 300 million Greek Orthodox Christians.
Biden arrived Thursday in Ankara to meet with leaders to discuss what his office called "the full range of bilateral, regional, and international issues."
On Sunday afternoon, he is to fly to Athens, where he is to meet with Greek President Karolos Papoulias and Prime Minister Lucas Papademos and other politicians "to continue close dialogue and cooperation with the Government of Greece," the statement said.
Biden departs Athens Monday evening for Washington.