That is the warning from Polish PM Donald Tusk to European leaders in Copenhagen. "We are in a time of war," he told the almost 50 leaders assembled for the 7th meeting of the European Political Community. "It's war, a new type of war, but it's war." It brings together leaders of all European countries, regardless of whether they are in the EU. Arriving at the conference, he was clear: "Migration and Ukraine will be the two dominant issues in the discussions today."