Brexit is the other face of the refugee crisis - tensions that lead to stasis, external risks that lead to asymmetric shocks.

The refugee crisis shows we can't be isolated from the world's geopolitical troubles.

Sovereignty is not just at the national level; that's the mistake of Brexit that other people make.

The refugee crisis is a challenge for the whole of Europe, and Europe - it's a very fair point to say it's not just a security issue. It's also an economic issue.

We have to be extremely strict on the implementation of Brexit so there is a common approach between member states. We must avoid a sector-by-sector or country-by-country approach, and ask the U.K. to be clear.

I am attached to a strict approach to Brexit: I respect the British vote, but the worst thing would be a sort of weak E.U. vis-a-vis the British.