The Kh-25 cruise missile was mostly built with Ukrainian parts. The Mi-17 helicopters were mostly built with Ukrainian parts.
Based on these plants being mostly in the eastern part of the country, there may be some logic to Russia taking that part of the country, and restarting the industrial complex.
BS. Kh-25 is not produced anymore, the only Mi-17 part of Ukrainian origin is TVZ-117 engine. Maintenance kits for it of Russian origin exist, although the engine is obsolete and replaced by newer VK-2500 in Russian service.