Russia has restarted an engine regeneration program focused on restoring Soviet diesel engines that were previously considered unrecoverable. This program has enabled the restoration of roughly 1,000 Cold War-era T-72 tanks, with plans to restore as many as 5,100 tanks total from its Soviet-era storage reserves. The headline slightly overstates completion — the program's goal is 5,100 tanks, but only about 1,000 have been fully restored so far. This matters because Russia is trying to offset massive tank losses in the Ukraine war, though analysts note these older tanks are less capable than modern armor and Russia's storage reserves are finite—only about 2,100 tanks remain in long-term storage after extensive mobilization since 2022.