Stockholm International Peace Research Institute (SIPRI) today launches the findings of SIPRI Yearbook 2013, which assesses the current state of international security, armaments and disarmament. Key findings include: (a) Alone among the five legally recognized nuclear weapon states, China expanded its nuclear arsenal in 2012; (b) The number of personnel deployed with peace operations worldwide is falling rapidly, due to the withdrawal from Afghanistan; (c) Progress towards a global ban on cluster munitions stalled in 2012.