Kinda. The T-64 was built at Kharkiv. That's why they kept them. They have all the tooling and equipment. They also have major refurbishment depots in Lviv, Dnipro, and Zaporizhzhia. The issue they are running into is that the old stored vehicles basically need to be gutted as all the lines and wiring and fittings and hinges and everything is rusted and rotten and leaky. They have a lot of old hulls to work with, more than they could ever use, but it is a lot of work putting them back into service.
Western tanks have active protection systems that work. T-14 is supposed to have one and the newest version of T-90 is supposed to have a system derived from Armata's as well. But alas.