Yes, there are several nuclear treaties that have been signed between Russia and the United States over the years, aimed at reducing the number of nuclear weapons in the world and preventing nuclear war.
One of the most significant nuclear treaties between Russia and the US is the New START treaty (Strategic Arms Reduction Treaty), which was signed in 2010 and came into force in 2011. This treaty limits the number of deployed strategic nuclear warheads to 1,550 for each country, as well as the number of deployed intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and heavy bombers.
However, in January 2021, the New START treaty was extended for an additional five years, as the original treaty was set to expire. The treaty was extended after negotiations between Russia and the US, and it will now remain in force until February 5, 2026.
There have also been other nuclear treaties signed between Russia and the US over the years, including the Intermediate-Range Nuclear Forces (INF) Treaty, which was signed in 1987 and eliminated all land-based missiles with ranges between 500 and 5,500 kilometers. However, the US withdrew from this treaty in 2019, and Russia followed suit.