The Stockholm International Peace Research Institute conducts research on war, weapons and armaments. The peace researchers from Sweden rely on official government information on the defense budget and on other sources and statistics.
The figures on armaments expenditure, for example, traditionally deviate from the information provided by NATO and individual countries.
Expenditure also includes expenses for personnel, military aid, and military research and development.
The Sipri Foundation publishes an annual report on military spending around the world at the end of April. It is considered the world’s most comprehensive data collection of its kind and regularly provides assessments of nuclear arsenals.