They have done just that, often.
Ukraine strikes their own buildings so they can blame Russia. They also fire on their own troops who want to surrender. They make a lot of claims that turn out to be false.
This is no shock because they had no problem warring with their own people for years in the Donbass. Zelensky was supposed to stop all of that and never did. It is a real shame he didn’t do what he promised. The lure of those western big bucks was too great.