The problem is that Ukraine never admit to anything.
They even denied the Crimean bridge bombing. Not to mention the Polish bombing where a polish farmer died.
We can not believe a word that comes out of the mouth of a Ukrainian official now when they deny this drone. How many countries would condemn this attack if it was them? They would loose more support.
Apparently it was a close call. Putin just got off the roof after adjusting his aerial. He was trying to tune in to a Scott Ritter podcast.