But that will depend on persuading all EU countries to share passenger and crew list information - quite a number of them regard this as illegal under European free movement laws.

BBC: The truth behind UK migration figures

It led to Paris introducing temporary border controls, suspending the free movement of people as guaranteed under the Schengen agreement.

BBC: Italy is rocky shore for Europe's boat people

The free movement of capital is also under attack.

ECONOMIST: European economies

It faces daunting challenges from China Inc. and the free software movement, and its high-margin boxes may yet fall under the same relentless cost pressure that has long strained most hardware businesses.

FORBES: What Makes Cisco Run

Free capital movement and pegged exchange rates are a dangerous mix (unless the currency is fixed under a currency-board arrangement as in Hong Kong, where all local currency must be fully backed by American dollars).

ECONOMIST: Keeping the hot money out