Thanks. If the adjacent province is between two armies, do they split it?

I've read several posts but still unsure. How to calculate a stack's supply consumption per turn? And how to estimate supply gathered from the map?

Well if all else fails, I'll get from Matrix.

I'm trying to buy this from your website.
But when I select the US flag and RUS, I get a database error.
Other games show correctly in the store.