Poland has achieved a significant diplomatic victory. U.S. President Donald Trump will visit the country July 6 to attend the Three Seas Initiative summit, a meeting of 12 EU members grouped along the Baltic, Black and Adriatic seas. Polish President Andrzej Duda said June 13 that he was moving the summit from Wroclaw in southwestern Poland to Warsaw to accommodate Trump's visit, which the White House announced June 9. Trump will visit Poland before going to the G20 summit in Hamburg, Germany. Trump's trip to Poland is highly symbolic. Poland is worried about the White House's commitment to security in Central and Eastern Europe , and Trump's ambiguity about Article 5, NATO's collective defense clause, has heightened Warsaw's concerns. The Polish government has worked for months to arrange high-level contacts with the Trump administration and to obtain reassurances about the U.S. commitment to its NATO allies in the region.