Back in 2010, defence spending in the Asia Pacific accounted for 20% of global defence spending. By 2020, that’s projected to have risen to 33% of the world’s total. It’s why some of the world’s biggest military companies are going all out at this week’s Singapore Airshow – Asia’s biggest aerospace and defence exhibition. The BBC’s Leisha Chi went to take a look at what’s on offer, and talked to IHS Jane’s analyst Paul Burton.