[6] On 28 May 2014, interview, Nikolay Testoyedov (president of ISS Reshetnev) stated that production of GLONASS-M would end in 2015, with GLONASS-K being exclusively produced after that final batch.

[7] On 14 December 2014, an interview with GPS World, he stated that because of international sanctions that limited the supply of radiation resistant electronics, they had decided to launch nine additional GLONASS-K1 as fleet replacement while they finished the GLONASS-K2 design.

[8] In May 2015 presentation, Mr. Testoyedov expected the serial production of GLONASS-K1 to start flying in early 2018, just after the launch of the first GLONASS-K2 prototype.

[14][15] The new satellites will improve location accuracy in urban canyons and increase redundancy in longitudes between 20° and 160° East covering most of Russia.

The new satellite's advanced equipment — made solely from Russian components — was expected to allow doubling the accuracy.

[18] A Space Forces spokesman told Interfax: "We have established and are maintaining steady telemetry communications with the spacecraft... the on-board systems of the Glonass-K satellite are functioning normally".

[23] The fourth GLONASS-K satellite Kosmos-2557 was launched on 7 July 2022 at 09:18:06 UTC by a Soyuz-2.1b launcher with a Fregat upper stage from the Plesetsk Cosmodrome.

[24] The fifth GLONASS-K satellite Kosmos 2559 was launched on 10 October 2022 at 02:52:32 UTC by a Soyuz-2.1b launcher with a Fregat upper stage from the Plesetsk Cosmodrome.