Will this lead to new improvements like counter intelligence agencies that can raise your protection from spies/weaken your enemies?
Also, do you think that a nation's defcon lvl should effect how successful spy attacks are on them? For instance, if a nation is in Defcon, it can be said that their nation is on "high alert" and it would then be far more difficult for an enemy spy to infiltrate the nation, IMO. I think if you did that, then it would make that dynamic of the game more interesting from a political viewpoint. Then, spy raids would only really be useful on defcon 5 nations, during peace time. This increases the likelihood that the prolonged epochs of peace we sometimes experience could be broken more often. Alliances will have to decide what their policies are with regards to peace time spying.