KeyPilot
EI-reg: no. Polish reg.
ATC transcripts: LiveATC doesn't have coverage of the FIR. Not sure if there are any other sites listening for that airspace (other than various military operations of course)
Crew testimony may be slow in being forthcoming - Ryanair may not want to look like an involved party if it meant having to divert around Belarussian airspace indefinitely - would make VNO-KBP a bit awkward for one thing.
Flightradar claims their data indicates FR crew delayed descent