The meeting of Bucharest Nine in Warsaw

President of Slovakia Andrej Kiska, President of Bulgaria Rumen Radev, President of Lithuania Dalia Grybauskaite, Latvian President Raimonds Vejonis, Polish President Andrzej Duda, President of Estonia Kersti Kaljulaid, President of Hungary Janos Ader, Chech Speaker of the Chamber of Deputies Radek Vondracek and President of Romania Klaus Iohannis pose for a family photo after the Poland's Independence 100th anniversary celebrations at the Belvedere Palace in Warsaw, Poland on 8 June 2018. Heads of States of Bucharest Nine countries, NATO's eastern flank countries (Poland, Romania, Estonia, Lithuania, Latvia, Slovakia, Hungary, Czech Republic and Bulgaria) meet in Warsaw to disscuss security issues in region and to adopt joint declaration for the upcoming NATO Summit in Brussels in July 2018. (Photo by Mateusz Wlodarczyk/NurPhoto via Getty Images)