Yeah and what that video doesn't show is that those Ukrainians were taking selfies in the moments prior to their death.
Right before the Russian tank column rolled up, they had just filmed themselves posing infront of the knocked out Russian BMP that was on the side of the road, maybe only a minute or two earlier. This video they took, of them all posing and smiling infront of the Russian BMP, was also posted online.
It looks like they took out that BMP, thought the area was secure and started taking selfies/videos. Only a minute or two later the Russian tank column comes up the road, and they mistakenly think it is their own guys. My guess is the Russian tank column knew they lost a BMP and were expecting to encounter hostile soldiers.
Very sad, they basically didn't even try to defend themselves.