The boom in global military spending is due, first and foremost, to the battle between the United States and China for supremacy in Asia. The battle between the US and China is forcing other countries in the region to actively arm themselves. America’s NATO allies in Europe are also their military spendings.
Trump is quite right that America’s NATO allies, particularly Germany and Canada, don’t spend enough on defense. Germany is reported to have less than twenty operational tanks. Canada’s armed forces appear to be smaller than the New York City police department. But the Europeans ask, ‘defense against whom?’