Lavrov said that in talks with U.S. officials, Russia was not getting "clear answers to most questions" about the system.
Moscow has criticized U.S. plans to deploy parts of a proposed missile-defense system in Poland and the Czech Republic.
Washington says the system is not aimed at Russia.
(ITAR TASS, AFP)
Russia And The West
COOPERATION, CONFLICT, CONFRONTATION: Relations between Russia and the West are notoriously volatile. "To see the kind of relationship that presidents Bush and Putin have developed and to see Russia firmly anchored in the West, that's really a dream of 300 years, not just of the post-Cold War era," then-national security adviser Condoleezza Rice said in May 2002.
But observers have increasingly called into question the extent of the shared values between Russia and the West, particularly on issues relating to the transformations going on in other former Soviet countries.
For news and analysis on Russia by e-mail, subscribe to "RFE/RL Russia Report."