[Klaus23]

As funny as your comment sounds, I wouldn't rule out the Ukrainians actually doing it. At least for sea+air and air+air, sub-drones are already a reality.

[m4rtink]

Yeah, there is at least one case where they (critically ?) damaged a Kilo class submarine using an underwater drone last year:

https://en.defence-ua.com/news/why_damaged_russian_kilo_clas...