“TASS. No independent confirmation possible.”
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That’s right the only ones doing it shut down their operations soon after the war started:
The OSCE Special Monitoring Mission to Ukraine (SMM) started its activities on 21 March 2014 and discontinued its operations on 31 March 2022.
https://www.osce.org/special-monitoring-mission-to-ukraine-closed
So TASS is free to tell any sort of lie that suits the narrative. And they will.