Russia’s Deputy Foreign Minister Sergei Ryabkov said that all types of notifications between Russia and the United States under the nuclear New START treaty have been suspended.
Russian state media said that Ryabkov’s statement included suspending notifications on test missile launches, although Ryabkov himself was not specific on that point. Such notifications are covered by the original 1988 treaty, which remains in force.
Ryabkov did say that "there will be no notifications at all. All formats are suspended.”
“All notifications, all forms of notifications, all data exchange, all inspection activities, in general, all types of work under the contract are suspended, they will not be carried out. And this does not depend on the position that the United States may take," Ryabkov said, according to Russian state media.
On Tuesday, CNN reported that senior US officials had disclosed that Russia will not provide the United States with data on its nuclear forces that is normally shared semi-annually – and in response, the US said it will not do so either.
Moscow’s move not to provide the information comes after President Vladimir Putin in February suspended Russia’s participation in the New START treaty, the only bilateral agreement left between the world’s two largest nuclear powers.
On Tuesday, Assistant Secretary of Defense for Space Policy John Plumb said that the US had pressed Russia about the exchange of information, due at the end of this month.
“Russia responded that they will not be providing that information,” he said. “And so as a diplomatic countermeasure, the United States will not be providing that information back.”
Notices about missile tests and other events involving nuclear weapons have been an important part of preserving strategic stability for decades. They ensure that neither Russia and the United States misinterpret each other’s moves.
What to know about New START: The treaty puts limits on the number of deployed intercontinental-range nuclear weapons that both the US and Russia can have. It was last extended in early 2021 for five years, meaning the two sides would soon need to begin negotiating on another arms control agreement. Under the key nuclear arms control treaty, both the United States and Russia are permitted to conduct inspections of each other's weapons sites, though inspections had been halted since 2020 due to the Covid-19 pandemic.
CNN's Kylie Atwood and Jennifer Hansler contributed previous reporting to this post.