Tthe tochka-u is a ballistic missile Ukraine has (although perhaps all of them are used up) but the article clarifies that this would be the first domestic-made Ukrainian ballistic missile.
If they get these things going and they have a good range then Russia will have even more supply problems. I know the public reason is to attack the airfields with the bombers but the real gain is in pushing Russian logistics even further back.
Sure, but it's not as if they are short on legitimate targets to select from. And Russia needs to protect them all. Oil infra, steel production, weapons manufacturing, rail control nodes, and probably a long list of critical supply companies to these sectors. If you can choke off supplies before they become supplies.. you are playing a longer game, but a more costly and devastating one at that.