Hi PBB, yeah I saw this story the other day, and immediately thought that satellites were the front runner. And the 'starlink train' would be a likely explanation, ... but just for the hell of it I will show my ignorance and mention that what doesn't quite compute in this tiny little mind of mine is the fact that there are clearly [after multiple viewings] only four of these 'objects/lights' and every other picture or video that i've seen of these modern day wonders show a heck of a lot more than the four shown by the cosmonaut Ivan Vagner.
I'm not saying that the 'starlink' is wrong... but have learnt not to simply take the obvious solution to such sights without registering any niggles. [so to speak]
For instance , does this bona fide picture from the exact same location just four months prior look so similar to the Russian film? ...
... Well maybe it's just my suspicious nature in overdrive on this, ... but as I say for me at least, it is just probable and not definite.
Cheers Buddy.