For Ukraine...(OBAT 079)
Per Wikipedia
(
https://en.wikipedia.org/wiki/List_o..._Ground_Forces)
Following heavy tank losses in the 2014 war + cold war, a lot of recapitalization of the Ukrainian tank fleet has been going on -- they were forced to bring back the T-80 due to losses in T-64s.
T-80BV M19 - T-80BV modernized with the same basic package as the T-64BV-2017 (Unit 030 T-64 Bulat M17). No official designation, but since the first unit was delivered in January 2019...I'm going with T-80BV M19. As of March 27, 2020 over 88 updated T-80BVs have up been delivered to the Ukrainian military since January 2019 at a rate of circa 6 tanks per month.