In comments aired on the Rossiya television channel, Ivanov said placing rockets in Poland and a radar station in the Czech Republic "presents an obvious threat to Russia."
Russia has continually voiced its opposition to the U.S. missile-defense system that Washington says is meant to offer protection against attacks from Iran and North Korea.
Washington's plans for the missile shield have led to a further deterioration of already unsteady relations between Russia and the United States in recent months.
Russia has proposed creating a joint missile-defense system with United States and NATO participation as an alternative to Washington's current plan, but U.S. officials have treated the proposal cautiously.
U.S. President George W. Bush (left) and Russian President Vladimir Putin at the G8 summit in Germany on June 7 (AFP)
MOUNTING TENSIONS. Relations between Russia and the United States have grown increasingly tense in recent months as issues like missile-defense, Kosovo's status, and Russia's domestic policies have provoked sharp, public differences. On June 5, U.S. President George W. Bush said democratic reforms in Russia have been "derailed"....(more)
MORE: A special archive of RFE/RL's coverage of U.S.-Russian relations.