Poland's President Andrzej Duda, left, and U.S. Energy Secretary Rick Perry, right, shake hands during a ceremony in which Poland's main gas company PGNiG signed a long-term deal for liquefied gas deliveries with the U.S. firm Chenier, in Warsaw, Poland, Thursday, Nov. 8, 2018. (AP Photo/Czarek Sokolowski)
Poland's President Andrzej Duda, left, and U.S. Energy Secretary Rick Perry, right, shake hands during a ceremony in which Poland's main gas company PGNiG signed a long-term deal for liquefied gas deliveries with the U.S. firm Chenier, in Warsaw, Poland, Thursday, Nov. 8, 2018. (AP Photo/Czarek Sokolowski)