Russia seems to be a landing spot for these objects
The only thing I can think of is a magnetic force.
That’s because Russia is vast.
Russia composes about 11% of the earth’s land area, so if something does come down randomly on land, there’s better than a 1 in 10 chance it will be in Russia. Russia + Antarctica are about 20% so there’s a 1 in 5 chance it will land in one of the two.
The defunct USSR spanned 12 time zones which is half way around the world. Russia was a big slice of that, making it a very large target for incoming space junk.
I was surprised to hear that Antarctica is prime hunting ground for meteorite debris. I wouldn't expect them to be found there for the same reason bugs hit a car's windshield a lot more than they hit the side windows.
Regards,
GtG