All eyes will be on Donald Trump as Nato leaders gather in Ankara this week following his administration's warning that allies must step up defence spending “immediately” or face consequences.Last year’s summit was hailed as a “breakthrough” after members committed to spending 5% of GDP on defence – 3.5% on core requirements and 1.5% on broader security needs – by 2035, said Elsa Ohlen on CNBC.

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