Here you have opinions about
Leopard 2A4 and
2A6 by Ukrainians itself from times of training opinions of tankers.
https://en.defence-ua.com/events/ukr...ages-6015.html
Pakistani
T-80UD are seriously considered to be send to Ukraine
https://en.defence-ua.com/news/pakis...tion-6030.html
Article about Russian T-80BVM which are now produced without important system Sosna-U
https://en.defence-ua.com/weapon_and...anks-5849.html
More about BTR-50 T-62 etc. archaic vehicles already used on front-line
https://en.defence-ua.com/weapon_and...here-5852.html