I’d get together with my loved ones, and try to find a place to hide. Aliens are going to spend the resources to get here unless they want our resources. If they have the technology to get here, they can probably overwhelm us easily, Presumably they would come in great numbers, planning to live here once they got here. It would probably be impossible to cross inter-stellar space without having many, many generations live and die in the ship.
I would not be happy about such an announcement. Not one bit!