The uncertainties surrounding policy shifts under U.S. President Donald Trump's administration are forcing European countries to adapt their own foreign policy strategies. Germany, for example, is focused on trying to avoid a trade war with the United States and on developing closer ties with the administration. Meanwhile, the United Kingdom wants to negotiate a free trade agreement with Washington that would give London more flexibility as it navigates the Brexit process. Poland's main concern regarding the new global order is the same as it's always been: national security. Warsaw's concerns are rooted in its age-old geographic vulnerabilities. Poland is at the heart of the Great European Plain, the largest mountain-free territory in Europe, which stretches from the French Pyrenees in the west to the Russian Ural Mountains in the east.