Ukrainian forces apparently took down the entire cell phone network or most likely just did a complete denial of service as well as information blackout I am going to bet that this was done in response for Russian military to be unable to call in backup and assistance during the special forces assault on the South Bank by Ukrainian special forces personnel.
And then on top of it more reports of Russian friendly fire on its own troops as there is no properly skilled forward artillery observers working with infantry units to be able to call in and correct artillery fire. So that is going to be an incredibly demoralizing event happening to the Russian Frontline troops to know that the artillery that's supposed to protect you can at any time be Misdelivered.
Again, zero receipts or sources. Lololol!