We are in the middle of a tough, ideological conflict that is being waged across the entire continent. On the one side are those who say that global challenges like migration and terror cannot be met with national parochialism. On the other side are those who would like to see a renaissance of the nation-state.

Europe was founded as a community bound together by solidarity.

Following the attacks in Paris, French President François Hollande has a completely different set of concerns. France needs more police, more security personnel and a greater emphasis on integration. He says that security is more important than the Stability Pact.

We are in the middle of a tough, ideological conflict that is being waged across the entire continent. On the one side are those who say that global challenges like migration and terror cannot be met with national parochialism. On the other side are those who would like to see a renaissance of the nation-state.

We're at a historical juncture: A growing number of people are declaring what has been achieved over the past decades in Europe to be wrong. They want to return to the nation-state. Sometimes there is even a blood and soil rhetoric that for me is starkly reminiscent of the interwar years of the past century, whose demons we are still all too familiar with.

Donald Trump is withdrawing from the Paris climate agreement because he wants to lower environmental standards for American products and manufacture more cheaply. His reasoning is quite simple, but very shortsighted. It won't succeed because, by doing so, Trump is missing a golden opportunity to modernize American industry.

Turkey is doing an enormous amount in the refugee question, but it can't continue to pay for everything by itself. That is why we have to talk to Turkey about money.