Military action
The Imperium began to invade Earth.
The Imperium started their invasion of earth. Planing just to destroy the planet from Jupiter is suddenly changed when humanity teleported half of their nukes to the invading forces. The nukes destroyed almost half of their fleet and communication networks. Making blowing up the planet impossible, and communications to their empire proven difficult. So the plan will be to siege the planet and take control of it. There they will establish communications to their empire for reinforcements.