Warheads developed during the cold war with ranges up to and including 7,000 km. Part of the arsenal for both sides, although the west had signifanctly more. They were designed to be nuclear equipped and used only in the "final conflict" between the ideaologies of east VS west. Death row won, I think.
Face it America, the Red army would have kicked the shit out of you.
The difference between an ICBM and a regular missile is that the ICBM is exceptionally long-ranged. In recent times it is most associated with carrying a nuclear payload which as we all know, are international in their range.