BBC: The US and Poland have signed a deal to locate part of the US's controversial missile defence system on Polish soil.
US Secretary of State Condoleezza Rice travelled to Warsaw for the ceremony, after 18 months of negotiations.
The deal has angered Russia, which has warned the base could become a target for a nuclear strike.
Washington says the system will protect the US and much of Europe against missile attacks from "rogue elements" in the Middle East such as Iran.
The agreement, which will see both US missiles and servicemen stationed on Polish soil, was signed by Ms Rice and Poland's Foreign Minister Radek Sikorski. US and Poland Sign Defence Deal >>> | August 20, 2008
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