The ranges for European capabilities (1,000km, 1,600km, and 2,000km) have been calculated from the eastern borders of relevant oblasts in Russia’s Western Military District, indicating the potential reach of missile systems designed to address NATO security concerns.

The range of Russia's 9M729/SSC-8 ground-launched cruise missile (2,500km) has been calculated from the western borders of Russia, Kaliningrad and Belarus, indicating the potential reach of a Russian attack.
ECFR · ecfr.eu