the shells used by the AFU cannot be destroyed using conventional means, western missiles are expensive, and few in quantity, and Anti-Missile Warfare is a lot more advanced than you think. Storm shadow missiles have been routinely destroyed despite their ‘stealth’ and ‘speed’. ATACMS on the other hand are not, so these missiles will be intercepted, even then russia would destroy the depots which house these missiles.

It’s also a myth that the reason these missiles were not delivered then was due to any perceived moral red lines(seriously a western politician having things like foward-thinking? Pah). No these missiles have to procured, developed, shipped and sent, all of this takes months especially in america, where military infrastructure is severely lacking. Another thing is these companies who make these missiles are very shy about their products, probably because they seriously underperform their own tasks.