Russian President Vladimir Putin's announcement Tuesday that Moscow is suspending its participation in the last remaining U.S.-Russia arms control treaty will have an immediate impact on U.S. visibility into Russian nuclear activities, but the pact was already on life support.
Putin's decision to suspend Russian cooperation with the treaty's nuclear warhead and missile inspections follows Moscow's cancellation late last year of talks that had been intended to salvage an agreement that both sides have accused the other of violating.
