According to the TASS infosite, the final launch of the last Glonass-M satellite is planned for 2020 and the last Glonass-K spacecraft will be sent into space in 2023, according to the Strategy of GLONASS Development until 2030 document.
Five satellites will be delivered to the orbit by rocket carriers in 2020 — one Glonass-M, one Glonass-K2 and three Glonass-K satellites. "The last Glonass-M satellite No 61 will be delivered to the orbit by the Soyuz rocket carrier in the second quarter of 2020," the document said.
In 2021, three Glonass-K satellites will be delivered to the orbit.
In 2022 and 2023, two Glonass-K and one Glonass-K2 satellites will be sent to space. "In the first quarter of 2023, the last Glonass-K satellite No 23L will be launched with the Soyuz rocket. Further on, Glonass-K2 satellites will only be launched," the document said.