Rather than space aliens, I find it far more compelling to consider that:
• Russia had been severely traumatized by WWII, less than a generation earlier. Tens of millions died in combat and of starvation.
• After WWII, Russia awas again severely traumatized by Stalinism and his political purges. For a decade, anyone who was even suspected of stepping out of line was oiable to get imprisoned or just executed.
• During the 1950s and early 1960s, the CIA was attempting to train Russian expatriates in the West to return to Russia as spies and organizers of underground resistance in the event WWIII broke out. The program was a complete disaster... The CIA trained and equipped dozens of young men, and then PARACHUTED them into Eastern Bloc countries,after which none of them were ever heard from, ever again. (It's assumed they were all immediately caught and executed.)
So in the early 1960s, when some dude in a parachute lands in your village, I think it's far less speculative to assume that they were afraid Yuri Gagarin might be a Western spy.
No need for space aliens... And no need to insult the intelligence of these Russians by lumping them in with ol' Karen up in Lethbridge, who was such a simple rube that we all laugh at her for calling the police on a Stormtrooper.
Honestly, I see why the "space aliens" narrative is appealing: It's funnier! It's hilarious to imagine old timey Russian villagers, hiding in fear of space invaders.
Unless anybody reading this happens to be Russian, in which case we'd be making up silly stories that mainly serve to depeict their parents or grandparents as a bunch of simple, stupid, gullible pigeons.
And I just don't see the point in that whole line of thinking, when we already have much more plausible theories, already.