Who's spending the big bucks on defense?

Every year two international organizations, the International Institute for Strategic Studies (IISS) in London and the Stockholm International Peace Research Institute (SIPRI) release independent estimates of international defense spending. While their methodologies and, therefore, their estimates differ, their data comes to the same basic conclusion: the US vastly outspends what many in the US today characterize as the threat nations: China, Russia, Iran, Syria and North Korea. We outspend them not just individually but collectively, by a factor of at least two.