From right, Romanian President Klaus Iohannis, Polish Prime Minister Mateusz Morawiecki, Croatian President Kolinda Grabar-Kitarovic and U.S. Energy Secretary Rick Perry arrive for a press conference in Bucharest, Romania, Tuesday, Sept. 18, 2018. Poland's prime minister said his country wants the U.S. to play a key role in Eastern Europe, to strengthen the continent as a whole. (AP Photo/Vadim Ghirda)
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