Biden, Erdogan
Turkish President Recep Tayyip Erdogan earlier this month said that he would no longer hold bilateral meetings with Greek leaders as provided for in a 2010 agreement between the two sides.
Turkey has also accused Greece of declining to extradite Turkish soldiers believed by Ankara to have played a direct role in the attempted 2016 coup against Erdogan.
Last month, Erdogan said that Greece's Prime Minister Kyriakos Mitsotakis "no longer exists" for him, accusing the Greek leader of trying to block the sale of F-16 fighter jets to Turkey during a visit to the United States.
