Russia is an obvious choice. But do not forget former eastern block countries like Poland, Lithuania, Czech Republic, etc. Also remember Sweden produces one of the most known vodka's in the world...Absolut.
Because vodka is a neutral spirit with no detectable taste other than that of the alcohol, there are actually no taste differences between countries or brands.
Absolut makes pear vodka!
Vodka
Tito's Handmade Vodka - Austin, TX
Heritage makes 40 proof vodka. The label states that it's "deluted vodka". You can buy it a any Albertson's Grocery on the west coast.
I believe it is in Russia the highest country for selling vodka
Blueberry Schmirnoff vodka with lemonade. (: mmm.
Every brand makes their vodka differently. Vodka itself is generally made from water and ethanol.
Poland.
Neither vodka nor rum contain sugar.
Sweden
russia
Vodka originated in Russia hundreds of years ago. The word Vodka is derived from the the Russian word for water "Vada". Vodka is made from grains, potatoes, etc.