As long as governments have opposed one another, I would offer.
The real shift, though, has occurred in the last five or six years. The more typical activities of espionage—of suitcases full of money, of coercion—are things that we've known about for a very long time, but over the last number of years, through the use of social media and the ability to invoke cyber-attacks against states, it has really escalated our awareness and drawn our attention to the area, simply because it's more pervasive and more aggressive, and because the potential for damage to our democracy is that much more serious.