If a clear signal was needed that the European Union is falling apart at an alarming rate, Hungary's construction of razor-wire fences along the border with its fellow EU member Croatia is it.
The crisis in the eurozone has, of course, fragmented financial flows, caused economies to diverge, eroded political support for EU institutions, and set Europeans against one another.
Now, as governments erect barriers and reinstate border controls, the refugee crisis is disrupting flows of people and gumming up trade. And, as the EU unravels, the risk of Britain voting to leave is rising.