Rice will also go to Warsaw to sign a formal agreement with Poland to base ballistic missile interceptors there -- another move, along with the eastward expansion of NATO, that has angered Moscow.

CNN: Rice to Russia: Stop playing 'dangerous game'

What they are trying to build in the missile defense agency and it's in the process of creating is layers of ballistic missile defense shield, which combines ground-base interceptors, which the Bush administration would like to have placed in Poland.

NPR: Missile Defense, the U.S. and Europe