Can Belgium sign the Lisbon Treaty?
However, this is not quite true, Brown will not be the only leader absent from the signing the EU Reform Treaty.
Belgium hasn't had a leader since June and the Belgian federal authority only has power in the matters that are formally attributed to it by the Constitution and the laws carried in pursuance of the Constitution itself.
The King concludes treaties, treaties may take effect only following approval of the Chambers.
Ergo, the current emergency cabinet cannot appoint a representative with 'full powers' to Sign the EU Lisbon Treaty.
See Vienna Convention on the Law of Treaties Article 7 & 8