Earlier quoted context omitted.
I believe there are at least three issues: 1. My guess is that you're right, the main reason this is happening is a nationalistic wish to blame others for the spread. But also: 2. As other commentators have noticed, it's difficult to socially distance in an airport. On the plane itself, there is extremely good ventilation and what limited evidence I've seen suggests that transmission is low, but in airports that migh…
> 1. My guess is that you're right, the main reason this is happening is a nationalistic wish to blame others for the spread. More than half of the world's population is under lockdown within their countries, and you still think that shutting down air travel is a nationalistic wish?
More practically, though, is that it's a measure that can only be effective if domestic transmission is not a major cause of new cases, which is true in only very few countries right now (and I believe none of those countries have banned visitors). Enacting such a policy at this late stage is a measure that looks like you're taking a strong stance while having virtually no effect at all, and could well be an attempt to distract from your own failures to contain it beforehand.
Given the way Putin has governed in the past decade, I am rather more inclined to believe that the primary goal of this measure is in fact propaganda.