"The use of either a large IRBM or an ICBM would not necessarily be of huge military significance given that – while they are much faster ... they tend to lack the accuracy to be employed with conventional payloads" https://www.rusi.org/explore-our-research/publications/commentary/oreshnik-ballistic-missile-russia-love
Comments
The accuracy is good enough for that and the IRBM cannot be intercepted by Ukraine, unlike most other rockets or missiles Russia so far used.