The US defense secretary, James Mattis, has reassured European allies that the US will defend any member of Nato that comes under attack from Russia, The Guardian reports.
During his campaign, Trump said he would not feel bound by Nato’s article five, under which an attack on any one of the 28 members is treated as an attack on all.
But Mattis, in contrast to Trump, told the Munich security conference on Friday: "Article five is a bedrock commitment." US security, he added, was "permanently tied" to that of Europe.