Brown promises to scale back Trident

The leaders of the world's greatest powers, including the Prime Minister Gordon Brown, are set tomorrow to endorse President Barack Obama's ambitious goal of ridding the world of nuclear weapons.

According to the final draft of a resolution to be put to a rare summit of the five permanent members of the UN Security Council, the leaders will resolve "to seek a safer world for all and to create the conditions for a world without nuclear weapons".

In an overt show of support, Mr Brown will unveil plans to cut the number of Trident nuclear submarines from four to three.

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