Can the Treaty of Lisbon be denounced after it enters into force?

Abstract:

Can the Treaty of Lisbon be denounced after it enters into force? That legal question becomes particularly acute after the President of the Czech Republic signed the Treaty of Lisbon on 3 November 2009, the Czech Republic being the last Member State to ratify the Treaty. Barring some extraordinary development, the Treaty of Lisbon will enter into force on 1 December 2009. Some have argued that in the absence of a referendum in the United Kingdom on the Treaty of Lisbon, it would be desirable for the UK to denounce the Treaty even if it has already entered into force. But would this be legally possible? The clear answer to this legal question is that, as a matter of international law, the Lisbon Treaty cannot be denounced after it enters into force.