Russia will probably just bring-in a trainload of Uyghurs to man the VW, Toyota, Ford and Hyundai factories. Imagine what those products will look like...
Even if they nationalize them, they will experience supply chain problems if constituent parts are are produced in other countries sanctioning Russia. A better idea is to build factories that produce those parts within Russia proper. Production of the final product is delayed either way, so no use crying over spilt milk under the bridge.