World's largest military spenders in 2016

Answer: 

USA 

"US military spending in 2016 was $611 billion—nearly 3 times as much as China's military spending, which was the second highest in 2016 at $215 billion. US military spending is larger than the next 8 biggest military spenders combined." 

-- According to Stockholm International Peace Research Institute (sipri)

Source: http://visuals.sipri.org/