The report you mentioned is about another plane allegedly shot down on Monday in the Donetsk region
Russian media has reported
each of these incidents separately, each time kind of celebrating them as DNR achievements:
- 14 July, 12:00, Aviation Safety Network Criminal Occurrence description
- 14 July, 18:24, LifeNews, Ополченцы взяли в плен экипаж сбитого Ан-26 украинских ВВС (Self-defense took POV the crew of downed Ukrainian An-26)
- 17 July, 18:34, LifeNews, Ополченцы сообщили о сбитом Ан-26 на востоке Украины (Self-defense shoot down an An-26 in eastern Ukraine)
- 17 July, 20:01, ITAR-TASS Donetsk People’s Republic militia downs another Ukraine’s An-26 plane — eyewitnesses
The problem with the last two from 17 July is that there was no An-26 shoot down at that day. And these news reports were published just a moment before it became evident that he alleged An-26 came out to be Boeing-777.