Is Russia burning through air defense missiles at an "unsustainable rate"?

https://www.cbsnews.com/news/u....kraine-russia-war-mo

Ukraine's deep strikes leaving Russia short on air defense missiles, possibly at an
www.cbsnews.com

Ukraine's deep strikes leaving Russia short on air defense missiles, possibly at an

Ukraine intelligence indicates the countrys stepped up drone strikes are forcing Russia to burn through interceptor missiles, possibly faster than it can build new ones.