The SIPRI Yearbook is an authoritative and independent source of data and analysis in the areas of security and conflict; military spending and armaments; and non-proliferation, arms control and disarmament.This 57th edition of the SIPRI Yearbook covers developments during 2025, including: · Armed conflict and conflict management, with an overview of global and regional developments in armed conflict, peace processes and peace operations· Military expenditure, international arms transfers and developments in arms production, documenting, in particular, the consequences of a significant unravelling of global security · The proliferation of missiles and uncrewed aerial vehicles, with a focus on their widening use in armed conflict· World nuclear forces, highlighting the nuclear modernization trends in the nine nuclear-armed states· Nuclear arms control, covering dialogues among China, Russia and the United States and in multilateral forums, as well as a series of major military strikes against Iran's nuclear and military infrastructure during the 12-day War · Chemical and biological security threats, including the investigation of allegations of chemical weapon use, and developments in the international legal instruments against chemical and biological warfare · Conventional arms control and the regulation of inhumane weapons, covering cluster munitions, explosive weapons in populated areas, landmines and small arms and light weapons· International governance of artificial intelligence, cyberspace and space security, with a focus on autonomous weapon systems· Dual-use and arms trade controls, reviewing developments in the Arms Trade Treaty, multilateral arms embargoes and export control regimes, and the legal framework of the European Union for such controlsIt also contains updated annexes listing arms control and disarmament agreements, international security cooperation bodies and key events in 2025.