She can go on repeated diplomatic missions to Turkey to beg Recep Tayyip Erdogan, the Turkish president, to act to stop the flow of asylum-seekers to Europe. The trouble is that the Turks keep asking for more money in return for their help, in addition to the €3 billion (£2.3 billion) the EU has already promised. And there are growing doubts over how much Mr Erdogan is really willing — or able — to do.