MOSCOW. May 6 (Interfax) - Washington will do all it can to allay Russia's concerns about the proposed U.S. missile shield in Europe, U.S. Ambassador to Russia William Burns said.

The U.S. is doing everything possible to give guarantees to Russia on what programs will be implemented in these countries [Poland and the Czech Republic], Burns said in an interview with Ekho Moskvy radio on Tuesday.

The United States has been working intensively enough with Russian colleagues to ally Russia's concerns about U.S. plans to deploy missile defense elements in the Czech Republic and Poland, and Washington will do all it can to broaden cooperation on missile defense with Russia and Europe, Burns said.

U.S. air defense sites in Eastern Europe would be operated by permanent staff, who would deal with the parties involved and provide guarantees on what is happening at these sites, he said. Burns announced that a discussion has been planned on when and how interceptors will be launched when a real threat of missile attack emerges from Iran.