Sure. If you can drop kinetic projectiles from orbit or higher, you don't need nukes.

But you have to build a lot of infrastructure to either get that mass up there, or compel that mass to change momentum.

One drone with a shaped charge could take out a fueled launch vehicle and make the bad unusable for an annoyingly long time. I hope that there are plans to defend against this.

Dropping rocks on Earth to declare independence is the plot of The Moon is a Harsh Mistress