It's not clear that they've stopped adhering to parts of the treaty. They no longer allow on-site inspections, but they were required to inform of repositioning of nuclear assets: The reporting implies that they still comply with the latter and that makes them especially visible to US satellites.
Russia says it will continue to inform the U.S. about any ballistic missile launches — but it hasn't said with clarity whether it will continue sending notifications about the movement of a broad range of strategic military assets.
"Every time a strategic item that's subject to the treaty, like a bomber or a submarine, moves, you send a notification," Rusten said. "So those are really important and they've been going on seamlessly throughout," even in the absence of inspections.
"If Russia halts data exchanges and notifications as required by the treaty in addition to on-site inspections and meetings of the BCC, it would make it much more difficult to verify Russia's compliance with the treaty limits," Bidgood said. "It would also eliminate important sources of transparency, predictability, and regular communication between Washington and Moscow, which are arguably more necessary now than ever."
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