If you can't physically keep a small (flying OR submersed) drone from hitting your naval ship you shouldn't be in the business of having a navy lol.
We aren't talking about a tank that may move through thick brush and complex terrain that could mask threats anywhere, we are talking about a large boat in the water which by definition is a large expanse.
I mean yes whatever works works, but it is undeniably pathetic and a direct admission that the russian navy barely exists as a serious concept the way we typically think about navies.