EU should treat Brexit as a wake-up call

WITH his ill-considered referendum on European Union membership, David Cameron, now departed as British prime minister, played Russian roulette - and lost. But the list of losers extends much wider. Underlined by last Thursday's renewed terrorist atrocity in France and the attempted Turkish military coup, Europe faces a rising tide of challenges on many fronts.

The remaining 27 EU members must treat the referendum result as a wak…