The military budget is often presented as the main indicator of a country's national security effort. The contents and comparison of state military spending are not definitely conceptualized, and national budgets are homogeneous neither in time nor in space. The NATO and SIPRI date are interesting, with some large approximations for great power such as China or Russia. It is often difficult to understand the military or civilian nature of a threat and new potential weapons against the security of a country are not included in the military budgets, such as economic war or cyber-attacks.