Depends where. Sure, there are parts of Russia where there is not even water and electricity in houses, but on other hand, St Petersburg and Moscow has richer people than anywhere in Western Europe. There is no greater polarisation between rich and poor than in Russia.
3) Strategic capacity is poor, just look at Afghanistan and Chechnya.
Different kind of warfare. Russians couldn't handle fighting guerilla fighters in their own harsh terrains.
Fighting on Russia's terms (army vs army), they would be crushed like Georgia was.