Russia promised to complete a partial pullback of troops from Georgia by the end of Friday but said an unspecified number of "peacekeeping forces" would stay inside the country, angering the West.
A top U.S. general visiting Georgia condemned the pullout as "far too little, far too slow".
"If they are moving, it's at a snail's pace," General John Craddock, head of the U.S. European Command, told reporters at Tbilisi airport, where he watched the arrival of a U.S. military plane bringing in aid.
Russia and Georgia went to war after Tbilisi attempted on August 7-8 to retake the Russian-backed rebel province of South Ossetia by force, provoking a massive counter-attack from Moscow by land, sea and air.
Russia's Defence Ministry said in a statement that military units supporting its peacekeepers would pull back by the end of Friday to South Ossetia from Georgia proper. President Dmitry Medvedev made a similar pledge earlier this week.
