Central and Eastern European countries' leaders attend a meeting with President of Poland Bronislaw Komorowski and US President Barack Obama in Warsaw, June 3, 2014. A meeting of the presidents of Poland and the United States -- Bronislaw Komorowski and Barack Obama -- with Central and Eastern European countries' leaders was held on Tuesday at the Presidential Palace in Warsaw. The topics of the meeting include the Ukrainian crisis, ties with Russia and security in the region, as well as energy security, according to the President's Chancellery. (Xinhua)