The US bid to promote a fourth round of sanctions may get lost amid sharp dispute over Russian military action in Georgia.
Moscow has gained leverage, threatened Georgia's pro-West leader, and bolstered national pride.
Georgian President Mikheil Saakashvili's failed attempt to retake South Ossetia may cost him dearly in Georgia, one of the strongest US allies in Russia's backyard.
American effort to spread democracy wanes in post-Iraq era.
The war broadened Monday as Russian troops moved beyond rebel provinces into Georgia proper.
After weeks of escalating skirmishes with South Ossetia, Georgia moved to regain control of the enclave. Russia responded by sending in tanks.
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Standoffs over Georgia and a US missile-defense shield stem from one main irritant: Moscow had no hand in designing global security after the USSR collapsed. Medvedev wants to fix that.