The never operational Daryal radar installation was demolished in 1989 after the United States claimed it was in breach of the Anti-Ballistic Missile Treaty.

The Soviet Union started a programme to replace all Dnepr (NATO: Hen House) radars with the intention that this would be complete by the mid 1990s [2] and five Daryals were under construction by 1983.

[3] The early warning system had a gap as it did not cover submarine launches of ballistic missiles in the Pacific Ocean.

[3] It is also closer to the Siberian industrial region which would make it cheaper as it has good railway and power infrastructure nearby.

[3] The Soviet Union announced that the new radar was for space surveillance rather than for early warning of missile attack, and hence was compliant with the ABM treaty.