The US and Poland have agreed a preliminary deal on plans for the controversial US defence shield, Warsaw has announced.
The plan would see the US base 10 missile interceptors in Poland in exchange for help strengthening Polish defences, said PM Donald Tusk.
The scheme is highly controversial and has been opposed by Russia.
Poland is reported to have demanded security help after Moscow threatened to target its missiles at the bases.
The Polish Foreign Ministry told the PAP news agency that the deal would be signed at 1800 GMT.
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The US wants the sites to be in operation by about 2012.
Russia has expressed concern about the system in the past, with one official saying the deal "complicates" global security.
(BBC)
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