I am so sorry the witness disappointed you.
But the way it works is a witness has to make positive statements concerning the prosecution's case. If you knew of any such witness, you would post it.
https://www.reuters.com/world/europe/russian-official-says-ukraine-struck-black-sea-navy-hq-with-missile-2023-09-22/
The Russian Naval HQ was destroyed, but Russia reports one person missing.