In his annual (well, almost) address to the Federal Assembly on 21 February 2023 President of Russia announced that "Russia is suspending its membership in the New START Treaty."

The Ministry of Foreign Affairs issued a statement later that day, in which it explained the decision and stated that

Russia [...] will continue to strictly comply with the quantitative restrictions stipulated in the Treaty for strategic offensive arms within the life cycle of the Treaty. Russia will also continue to exchange notifications of ICBM and SLBM launches with the United States in accordance with the relevant Soviet-US agreement signed in 1988.

The Federal Law on the suspension was approved by the State Duma and the Federation Council on 22 February 2023 and signed by the president on 28 February 2023. The law entered into force on 28 February 2023.

In a statement issued on 15 March 2023, U.S. Department of State called the decision "legally invalid" and asserted that "Russia remains bound by its obligations under the treaty."