they had the ability to manufacture near everything as recent as 30 years ago.
reactivating it all and bringing it up to more modern standars will be difficult, but not impossible, and they're capable of doing it i think.
the question is whether they also have the political will to do it, because it will come with very real costs and significant reduction in prosperity and quality of life. we will see if putins state is resilient and powerful enough to push this without getting toppled by potential backlash.
a big factor in whether the nation will be willing to shoulder these burdens is the outcome of the war. if they achieve something that can be portrayed as a glorious victory for the russian people, then they might be able to do it. but if they get a humiliating defeat instead it's gonna be very difficult to convince the people that they have to suffer and sacrifice for decades in order to make up for the damage caused by putins failed attempt at emulating alexander the great lol