The chart below shows how much some of NATO member states spent on their military last year, according to a report published by the European Military Network (ELN).

United States' share is huge. In 2014, the US spent about $582 billion (£400 billion), almost three times more than all the other NATO states combined.

Across the pond, Britain captured the second largest share with $55 billion (£36 billion) invested in its armed forces. However, this is less than a tenth of what the US spent.

Not all NATO members spent the same percentage of GDP on its military. Germany's $44.30 billion (£23.65 billion) expenditure represents just 1.15% of its GDP, while Estonia's $430 million (£280 million) invested in its military accounted for around 2% of its GDP in 2014.

Editors note: the following chart does not reflect the military budgets of all 28 NATO members. A few are excluded, either because their budget is too small compared to the other states, or because the data were not available.