Rescue workers in yellow vests gather at the Place de la Bourse to pay tribute to the victims of Tuesday's bomb attacks in Brussels, Belgium, March 25, 2016. REUTERS/Christian Hartmann
Militant Islamist fighters waving flags, travel in vehicles as they take part in a military parade along the streets of Syria's northern Raqqa province June 30, 2014. REUTERS/Stringer
Rescue workers treat victims at the airport, in this image taken from television video, after a blast in Brussels, Belgium, March 22, 2016. REUTERS/RTL Belgium via Reuters TV
A police helicopter hovers over Brussels' rooftops following bomb attacks in the Belgian city, March 22, 2016. REUTERS/Christian Hartmann
The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
— Peter Thal Larsen and Paul Taylor are Reuters columnists. The views expressed are their own —
— Margaret Doyle is a Reuters columnist. The opinions expressed are her own —