The US Department of State has released a fact sheet on the New START Treaty aggregate Numbers of strategic offensive arms.
The data in this Fact Sheet comes from the exchange of data required by the treaty, and is current as of March 1, 2020.
New START is a nuclear arms reduction treaty between the United States and the Russian Federation with the formal name of Measures for the Further Reduction and Limitation of Strategic Offensive Arms. It was signed on 8 April 2010 in Prague, and, after ratification, entered into force on 5 February 2011.
Source: US Department of State