Irish Prime Minister Leo Varadkar raised the prospect of a return of soldiers to the border, in his most explicit warning yet of the consequences of Brexit going badly awry.
After the U.K. leaves the European Union, Ireland’s 310-mile (500-kilometer) border running from near Derry in the north to Dundalk in the south will form the EU’s land frontier with Britain. Today, the border is free of checkpoints or patrols.
