A nuke with no way to get it to an alien ship in space is irrelevant. The alien ship will have no problem throwing rocks at us. It's pretty hard to imagine some sort of stardrive that doesn't provide a practical kinetic bombardment capability.
About the closest to a weaponless drive would be the Bergenholm of the Lensman series--but even that was eventually used to throw planets.
A nuke with no way to get it to an alien ship in space is irrelevant. The alien ship will have no problem throwing rocks at us. It's pretty hard to imagine some sort of stardrive that doesn't provide a practical kinetic bombardment capability.
About the closest to a weaponless drive would be the Bergenholm of the Lensman series--but even that was eventually used to throw planets.