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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 ÃÛÑ¿´«Ã½'s Mike Johnson asked one of our regular commentators, the US economist Irwin Stelzer. Photo by Seung-il Ryu/NurPhoto via Getty Images