US President George W. Bush warned Tuesday that Iran, if armed with a nuclear weapon, would be "incredibly dangerous for world peace."

"Iran with a nuclear weapon would be incredibly dangerous for world peace," the US president said as he attended his final summit with European Union leaders.

"So we've got to continue to work together to make it clear, abundantly clear, to them, that it's their choice to make: They can either face isolation or they can have better relations with all of us if they verifiably suspend their enrichment program," said Bush.