Russianlawmakers formally pulled the treaty from consideration in the Duma after the mid-term elections, citing political doubts, although they can resubmit it at any time.
However when it was ratified in Moscow, Russianlawmakers linked it to the preservation of an earlier Cold War deal - the ABM - which prevented either side from creating a national missile defence system.
Meanwhile, Bush administration officials have been growing increasingly concerned about possible infiltration of Western companies and financial markets by suspected organized-crime figures with ties to the Russian government, according to administration officials, lawmakers and law-enforcement officials.
The delegation -- which was to have included members of the Russian parliament along with the U.S. lawmakers -- was to have gone to Belgrade this weekend.
Lawmakers said the bombing revealed failures within the nation's counterterrorism agencies, including intelligence-collecting from Russian authorities and managing U.S. databases of potential terrorists.