So once again I'm sure to be missing an obvious step. I place my spies on enemy planets in hopes of disrupting economy or whatever. They seem to last a turn, sometimes even two. Is this the norm, or is their a way to increase their skill level so they stay longer? Also whenever I try to find the level of influence I have over a planet with a spy on it I'm informed that my espionage level is not high enough. How do I increase this? The only espionage related item in the tech tree is counter intelligence. Thanks for any help you could offer.