How did Russia's relationship with the United States change in the post-Soviet era regarding nuclear disarmament?

Russia carried out some nuclear disarmament measures with the United States.

Russia engaged in nuclear disarmament measures with the United States in the post-Soviet era.

The declaration on the disintegration of the USSR and the formation of the Commonwealth of Independent States (CIS) came as a surprise to the other republics, especially to the Central Asian ones. The exclusion of these republics was an issue that was quickly solved by making them founding members of the CIS. Russia was now accepted as the successor state of the Soviet Union. It inherited the Soviet seat in the UN Security Council. Russia accepted all the international treaties and commitments of the Soviet Union. It took over as the only nuclear state of the post-Soviet space and carried out some nuclear disarmament measures with the US. The old Soviet Union was thus dead and buried.