Russia.
The Russians .
Russia
Russia.
Russia.
RuSsIa
Soviet Union.
Germany or France
A reparation is :Usually, reparations. compensation in money, material, labor,etc., payable by a defeated country to another country or to an individual for loss suffered during or as a result of war.
Russia suffered the most total casualties.But in terms of percentage of of military forces it was Austria-Hungary
Russia suffered the greatest loss of life during World War I. There were thousands of casualties on all sides suffered during the war.
Chile and Saudi Arabia suffered the most.