After Putin succeeded in annexing Ukrainian regions and holding a referendum in them, there are reports in the pro-Ukrainian media saying that the Ukrainian army succeeded in retaking large parts of these regions. This was accompanied by silence from the Russian side to comment on the matter.
Is it possible that the news is true or is it only for media consumption as the two parties are accustomed to doing?
There isn't really much disagreement as to which territories are under Ukrainian or Russian control. See
https://liveuamap.com for example.
Ukraine did take large parts of territory back. Also Russia never had control of some of the territories it claims to have annexed. Russian side wasn't really silent about it, although it used euphemisms - e.g. "regrouping" instead of calling it a loss, or a retreat.