Recently there's been news about how the US is intending to pull out of the Open Skies treaty, which allows participating nations to perform unarmed reconnaissance flights over each other's airspace.
I'm wondering what's stopping the US from getting its intelligence from its NATO allies who are still authorized to perform the flights. If this sharing is allowed (and it'd presumably be hard to stop clandestine sharing) then it seems the party that loses more is Russia. So long as Russia does not exit the treaty too, then the US can both have its cake and eat it too by pulling out. Superficially it looks bad enough from the Russian point of view that Russia should exit the treaty pronto as well, but I've not seen any indication of that.
Is there something that stops the countries from sharing intel from Open Skies with allied countries? If so, what is it and how can signatories be sure it will be adhered to? If not, why is Russia apparently not alarmed?