I don't want to turn this into a political debate. So how about you just accept that I wouldn't like to pretend to be a character in a fictional version of Russia right now and I accept that you would like to see it? That sound good?Why not? If it's about some politics BS, then what does it have to do with a video game, a Pokemon game of all series?
Yeah, I find it weird and biased that barely anyone thinks of Russia as a possible region for a Pokemon game - literally THE biggest and most diverse country on planet Earth BY FAR, and when/if they do, they bring up something completely unrelated to justify placing some other tiny country higher in their region wish list.
Well, and as to few people considering Russia; for most of the world Russia is synonymous with a monotonous, permanently snow-covered landscape. I know that's not true, but that is the common (miss)conception, so no need to feel "biased" against.
And even without "some unrelated reason" Russia would not be my number one spot. Whether it's the largest country is completely irrelevant. And "most diverse" Idk. In Australia we have every terrestrial biome form except for Glaciers (and maybe thundra, probably).
If we are talking culturally diverse. I suppose, but it's many cultures not many people have heard of, might as well ask why people don't scream for region based on Kazakhstan. Most people do think of the European portion when thinking of Russia.