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Only 5 NATO member states - the US, UK, Poland, Greece and Estonia - meet the 2% of GDP defence spending commitment that the alliance is built upon. Luxembourg spends less than 0.5%. NATO's secretary general, Jens Stoltenberg, has declared that non-US members of the alliance will boost their defence spending by about 12 billion dollars this year. So how impressed is the White House likely to be with that? The Â鶹Éç's Mike Johnson asked one of our regular commentators, the US economist Irwin Stelzer. Photo by Seung-il Ryu/NurPhoto via Getty Images