US Secretary of State Mike Pompeo shared a picture of fireworks exploding over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations, in a New Year's message on Twitter.
The image, shot by Petros Giannakouris of the Associated Press, was one of four depicting New Year's celebrations around the world.
The US Secretary of State Mike Pompeo said on Monday the United States has made clear to Turkey that its purchase of Russian S-400 missile defense systems would endanger the security of US military technology and personnel.
Pompeo said he has urged Turkey to resolve the S-400 issue in co-ordination with the United States.
Turkish authorities on Friday issued a navigational for firing exercises in the Mediterranean, in an area between the Greek islands of Rhodes and Kastellorizo.
The Navtex reserves the area for December 9 and 10, which will coincide with a European Council summit on December 10 and 11 during which possible sanctions against Ankara will be discussed.