It is ridiculous to believe that Greece might be taking in one million migrants, registering them, then giving refuge to those who have a right to asylum and sending everyone back that does not. Greece is not doing that. We can blame the Greeks for that, but at the same time we should change the Dublin Regulation. When we insist on this unrealistic procedure, it means nothing more than that we are defending Dublin while renouncing Schengen.

But joint pressure from states like Germany, Italy and France could mean a move in this direction. Because something very fundamental is on the line: freedom of movement. I can't think of any common market that could function without it.

The message that "we can't take in everybody" is imperative. At the same time, the decision as to who has a right to asylum needs to be made in Brussels.

And a united Europe will also manage to send hundreds of thousands of migrants, who don't have the right to asylum, back to their homelands. Though that, given the number of flights necessary, would be of a scale reminiscent of the Berlin Airlift.

I'm not particularly optimistic, but I hope that the lack of alternatives will lead to it. I would like to remind you of the fact that before May 2015 there was no overall European agenda on immigration. Nothing, zero. It wasn't until after yet another tragedy in the Mediterranean that, in response to an Italian initiative, (Europe) began thinking about setting policies for the registration of refugees, their distribution or their deportation.

The route for the refugees currently goes through Greece and the Balkans or through Italy; if there were a crisis in north-eastern Europe, Poland might just as well be affected. In this case we are dealing with mechanisms that we do not control. We need to change that.

We [European countries] probably need to move forward together, each at their own speed. The faster ones, that could be the countries in the euro zone. The others would be those who are interested in the continued development of the common market, but reject the idea of an ever stronger political integration.