The United States and Poland have launched negotiations over the deployment of an anti-missile shield, ITAR-TASS reported, citing diplomatic sources.
US Assistant Secretary of State John Rood will discuss in Warsaw the deployment of 10 interceptor missiles on the territory of Poland.
Prior to Thursday's talks, Polish Foreign Minister Anna Fotyga said the results of the negotiations could not be predicted.
"We believe that time is still needed to clear up any misgivings completely," she said, as cited by dpa. She added that previous talks had been "interesting," but it was too early for a decision.
The United States wants to build a radar station in the Czech Republic and a missile battery in Poland to defend against possible missile attacks from what it calls "rogue states" such as Iran or North Korea.
Russia took a staunch stance against US plans for an anti-missile shield in Europe, arguing it would alter the continent's geo-strategic landscape.
The scheme had earlier come under fire from states like Luxembourg and Austria, who said the anti-missile bases in Central Europe could provoke new tensions with Russia.
Warsaw and Prague have come under criticism for dealing with Washington directly over the scheme, instead of through NATO structures.