Hypersonic missiles are different. I think the idea with those is whether they have a warhead or not they come in so fast you can't possibly shoot them down. The US, Russia, and China are all either confirmed or rumored to have hypersonic delivery systems like this.

The "rods from God" concept is the idea of creating an artificial meteorite as a weapon that comes in from space. These may or may not already exist, but if they do they'd be secret and would probably violate some treaties.