Australia’s decision to increase defence spending is hardly unique. Global military expenditure in 2019 reached a new high at US$1.9 trillion. Experts warn of an increased risk of military miscalculation. Just as concerning, they say, has been the breakdown of traditional arms reduction and containment treaties. The biggest of them NewSTART is due for renewal early next year, but there are concerns a second term for President Trump could derail the agreement.