“Vladimir Putin has dug a pretty big hole for himself. An attempt to go around the back of a major treaty that actively made his country safer has ended up sinking the treaty. Rather than endure a humiliating climb-down that would involve admission of cheating and the destruction of the new missiles, Putin is blustering new threats.”

https://www.popularmechanics.com/military/weapons/a26431348/russia-putin-inf-treaty-new-nukes/