Cuba's UN representative Abelardo Moreno delivered the signed document at United Nations headquarters Wednesday, according his spokesman, Alaim Pena.

"This sovereign decision of the Cuban government illustrates its irrevocable commitment to the fight against terrorism under all its forms," a statement from the Cuban UN mission said.

While joining the convention, Cuba made clear that the US naval base at Guantanamo Bay, where some 230 "war on terror" detainees are held, is located on its territory against its will and that Havana bears no responsibility if the United States "deployed nuclear material or nuclear arms in this illegally occupied territory."

The convention, part of 13 existing UN instruments dealing with the fight against terrorism, was adopted by the UN General Assembly on April 13, 2005.

It enjoins state parties to take "all practicable measures, including, if necessary, adapting their national law, to prevent and counter preparations in their respective territories for the commission within or outside their territories" of acts of nuclear terrorism.

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