German Chancellor Angela Merkel arrives to sign the condolence book at the Gedaechniskirche in Berlin, Germany, December 20, 2016, one day after a truck ploughed into a crowded Christmas market in the German capital. Credit: Reuters

Is Angela Merkel Still Unbeatable?

Merkel, Europe’s longest-serving leader, has looked like the one safe bet in the region as angry voters have taken down leaders in Britain, Italy and France. But the Berlin market attack is a reminder that even she is vulnerable to events on the ground.