Jan Fischer, the Czech Republic's prime minister, has told EU leaders he fully expects his country to back the EU's Lisbon Treaty by the end of this year.
But Vaclav Klaus, the president of the Czech Republic, who some describe as a Eurosceptic, is openly hostile to the treaty and will not sign it before a legal challenge in the Czech Constitutional Court is heard.
The Lisbon Treaty cannot take effect unless all 27 EU countries ratify it. All but the Czech Republic and Poland have done so.
Jonah Hull reports.