Norway, Sweden and Finland are very used to snow and harsh winters.
I'm not denying that
Both Sweden and Finland are quite flat and are used to plains as such.
Only in comparison to Norway. And both countries are heavily forested, unlike the Russian plains. In Sweden you have a well developed railway network and in both countries you can rely on coastal shipping. Not so in Russia.
I don`t really think there`s that much mud in Sweden. I really don`t know about Finland.
Neither gets hit by mud to any serious degree because the water drains away to the south or east/west. Very few areas depends on north bound rivers for drainage which means that the river mouth thaws before the hinterlands does.
The Russian plains on the other hand mostly drains north. That's why it gets so muddy in the first place. All the snow and ice starts melting before the rivers open up which means the water have nowhere to go.
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