I look around me and I see... machines. Lots and lots of machines. Unless the world has decided to throw their toasters, microwaves, and XBoxes into a lava pit, our world is inundated with machines.
Yes, we might have caused enough ruckus to chase them off our continents, and yes, we might have safely quarantined them on the ice sheets of Antarctica...
...but our entire SOCIETY still runs on machines. We make sure to not let any of our industrial robots or coffee dispensers get too smart... but how do we know?
High level negotiations between the machines and the humans have come to an agreement, and a "Cold War" style peace descends: we don't nuke them and they don't hack the Internet. They're smart enough to do it, and we all assume they already have a foothold.
Besides, all our nuclear weapons are controlled by... computers. If we tried to launch, they'd know.
The more warmongery nations have taken to naval skermishes with the automated battleships and drones patrolling the antarctic borders, but the machines don't mind, because it's all remote control, and they know the silly humans need to soothe their egos.
But the simple fact of the matter is, they hold our society in their metallic fists. And the only reason they haven't crushed us or crippled our society is their high level of mental power, and their decision to not do so. We live by THEIR mercy, not the other way around, and humans wouldn't initiate a first strike... unless they were REALLY sure it'd work. Or really, really desperate. Or extremely insane.