Call me an optimist, but I think that if an android was actually going to destroy life as we know it, nations would do everything in their power to advert the disaster.
"According to The Atlantic, an asteroid that weighs more than 1.7 quadrillion metric tons could sterilize Earth by raising the temperature of its water above 100°C. This asteroid would be 10–1,000 times heavier than the asteroid that killed the dinosaurs and would be between 60–96 kilometers (37–60 miles) wide."
The Atlantic article itself is paywalled, but yes, and it's entirely dependent on the mass of said Asteroid.