OK, I give up...I see this station frequently calling CQ on FT8. Have yet to see a contact. Like today calling CQ dozens of times but evidently not answering the stations calling in response, including me. The callsign is not on the QRZ database and doing a Google search reveals the callsign associated with the "Donetsk People's Republic." Requests qsl's sent to a Russian ham. Has anyone had a qso with D1DX? Is it a valid callsign?