Further, Russia has been notified in advance of the move.
But the fact sheet underscored that "The United States continues to abide by the treaty's central limits, and to fulfill all of its New START obligations that have not been included within these countermeasures."
Crucially, the most important of the countermeasures bans all Russian inspectors from visiting US territories. This was the most important aspect to the agreement, given that among the nuclear reduction treaty's chief aims is to ensure inspection and monitoring of each side's nuclear arsenal by the other. However, it had already been on pause since 2020 in relation to Covid restrictions and lockdowns.
Related to central monitoring protocols, the US is also backing away from basic information-sharing with the Kremlin. Washington will now withhold "notifications required under the treaty, including updates on the status or location of treaty-accountable items such as missiles and launchers."
Additionally, data will no longer be shared about future missile tests, including "telemetric information on launches of US ICBMs and SLBMs," according to the State Department.
All of this comes very dangerously as nuclear saber-rattling continues in relation to the Ukraine war. Russia has recently ordered tactical nukes to be hosted on Belarusian territory - a move the West has condemned.