The EU member states once again feel the need for solidarity as Russia keeps back gas destined for them at the Ukraine border.It meant one less tool for the EU foreign ministers meeting in Prague. Part of the irony lies in the inclusion of a solidarity clause in the Lisbon Treaty, which the Czech hosts alone have still not voted on. But the deputy prime minister, Alexandr Vondra, did manage to strike a positive note. He said: “Some member States have decided to make some symbolic gestures, and I will mention Poland which is delivering the gas by trucks to Slovakia.” The ministers dragged out the now familiar refrain that the EU should further diversify its sources of energy supply. The energy ministers will take up the matter next Monday.