[5] According to Russian sources, the system will be deployed at points surrounding Moscow by the end of 2018.

[4] On 4 June 2019, the Russian Ministry of Defense posted a video showing the successful interception of the test target which was a test of a new anti-ballistic missile system in the form of a long-range surface to air missile.

Though the nature of the air defense system which was being tested was not mentioned it has been widely speculated to have been a test of the S-500 Prometheus long-range surface to air missile system which entered early production earlier in the year.

The anti-ballistic missile system was tested at Plesetsk Cosmodrome, on 15 April 2020, at the ex-launch site of the Tsyklon-2 rocket.

The breakdown of the satellite caused space debris to form, which forced the crew of ISS to shelter.