There has been somethink kinda like that, just not long term orbit: https://en.m.wikipedia.org/wiki/Fractional_Orbital_Bombardment_System https://en.m.wikipedi

There has been somethink kinda like that, just not long term orbit: https://en.m.wikipedia.org/wiki/Fractional_Orbital_Bombardment_System https://en.m.wikipedia.org/wiki/Fractional_Orbital_Bombardme... The other nuclear powers did not like it and it was scrapped. Not to mention that even if you might get the first shot this way, there will almost certainly be retaliatory strikes back on you.