Carl Bildt, co-chair of the European Council on Foreign Relations and former prime minister of Sweden, shares his perspective on European politics, this week from the Oslo airport.

Is the political career of Boris Johnson over?

Seems to be the case but you can never be entirely certain, in his particular case. I think he has the ambition to come back. And clearly, he's going to remain a dangerous, in my opinion, a very disruptive force inside the Conservative Party. If they lose the election next year, which is not unlikely, mildly speaking, there might be a civil war and Boris Johnson might be one of the leaders of that particular civil war inside the Conservative Party. But remains to be seen.