Where was it filmed?
By Sunday evening, a Twitter user had suggested the video was filmed in a dairy plant in Malaya Rohan, to the south east of Kharkiv. The BBC has used geo-location tools to confirm the location. The area had recently been re-taken by Ukrainian troops from Russian forces.
Who are the soldiers?
The accents of the captors are consistent with them being Ukrainians from the east of the country. That, however, does not confirm they are Ukrainian soldiers - it remains possible they could be pro-Russian separatists from this region.
They're also wearing uniforms with blue armbands as used by Ukrainian forces, although again this is by no means conclusive.
We showed the video to several trauma surgeons and former military doctors who gave us their expert opinion but wished to remain anonymous.
One said he had treated soldiers who had sustained gunshot injuries who didn't shout or scream and said the lack of bleeding on some of the wounded soldiers could be explained by them having had a tourniquet applied (visible in the video).
He said: "It is my opinion that the footage cannot be categorised as 'fake' purely based on the images seen. This requires an investigation for war crimes."
Another doctor said: "It appears genuine... these meet the description of punishment shootings to the limbs".
Other people on social media pointed to the lack of apparent recoil on the assault rifle when it was fired, claiming it could have been firing blank rounds.
Mr Reynolds points out that the AK-74's 5.45mm round is small-calibre and has very little recoil but he also added "the video quality isn't great".
The BBC is continuing efforts to verify this video and will update this piece if more evidence comes to light.
https://www.bbc.com/news/60907259
Does video show Russian prisoners being shot?
By Reality Check & BBC Monitoring BBC News
Where was it filmed? By Sunday evening, a Twitter user had suggested the video was filmed in a dairy plant in Malaya Rohan, to the south east of Kharkiv. The BBC has used geo-location tools to confirm the location. The area had recently been re-taken by Ukrainian troops from Russian forces.
Who are the soldiers? The accents of the captors are consistent with them being Ukrainians from the east of the country. That, however, does not confirm they are Ukrainian soldiers - it remains possible they could be pro-Russian separatists from this region.
They're also wearing uniforms with blue armbands as used by Ukrainian forces, although again this is by no means conclusive.
We showed the video to several trauma surgeons and former military doctors who gave us their expert opinion but wished to remain anonymous.
One said he had treated soldiers who had sustained gunshot injuries who didn't shout or scream and said the lack of bleeding on some of the wounded soldiers could be explained by them having had a tourniquet applied (visible in the video).
He said: "It is my opinion that the footage cannot be categorised as 'fake' purely based on the images seen. This requires an investigation for war crimes."
Another doctor said: "It appears genuine... these meet the description of punishment shootings to the limbs".
Other people on social media pointed to the lack of apparent recoil on the assault rifle when it was fired, claiming it could have been firing blank rounds.
Mr Reynolds points out that the AK-74's 5.45mm round is small-calibre and has very little recoil but he also added "the video quality isn't great".
The BBC is continuing efforts to verify this video and will update this piece if more evidence comes to light.