Other leaders, however, played down the extent to which they went beyond existing commitments to increase contributions to their own defence, as Trump demanded they share more of what he calls an unfair burden on USA taxpayers in funding an alliance focused on discouraging pressure from a resurgent Moscow.
Trump emerged declaring continued commitment to a Western alliance built on U.S. military might that has stood up to Moscow since World War II.
When questioned in Latvia on his way to the summit in Brussels, Belgium, Trudeau said that Canada has no plans to double its defence budget when asked about meeting the two per cent figure directly. "The president has been consistent that he wants to see people spending more on defence in their countries and we are very pleased that we are doing exactly that".
Tusk also noted that the European Union has helped the United States on numerous occasions, sending troops to fight and die in Afghanistan and after the 9/11 terrorist attacks.
Politico said Trump warned of "grave consequences" if the allies did not immediately meet the 2 per cent spending targets.
Trump has said next week's meeting with Putin "may be the easiest" part of his European tour.
He vowed to bring up Syria and allegations of Russian meddling in the U.S. presidential elections, which his campaign is accused of colluding in.
At the end of the first day, Trump unsettled allies even more by questioning the value of the military alliance, which was formed to counter Soviet aggression during the Cold War.
"It's a horrific thing being done where you're feeding billions and billions of dollars from Germany. into the coffers of Russian Federation when we're trying to do something so that we have peace in the world".
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Just a few hours before he was due to leave for Britain, Mr Trump had more to say apparently - and he said it.
Meanwhile, the Wall Street Journal reported Trump as saying "I'll do my own thing" if spending is not immediately increased.
Trump said he made his anger clear to allies on Wednesday.
On the USA president's claim that Germany was "captive" to Russian Federation, an unhappy German Chancellor Merkel countered with recollections of her own experience of living in Soviet-controlled East Germany. He said the allies had confirmed their intention to meet the goal of 2 per cent by 2024 and no more.
Although administration officials point to the long-standing alliance between the United States and the United Kingdom, Trump's itinerary will largely keep him out of central London, where significant protests are expected. But now, according to media reports, Trump has threatened to withdraw the USA from the North Atlantic Treaty Organization (NATO, ) or to change its pivotal role in the alliance, over the matter.
Trump later called the meeting a "success". "I let them know I was extremely unhappy with what was happening" and on Thursday he had been "probably a little bit more firm". On Thursday, he was asked at North Atlantic Treaty Organisation whether his tweets aboard Air Force One later in the day might sound a different tone than his show of unity at the press conference.
Trump pointed to the texts to label the ongoing investigation a "rigged witch hunt", and said the probe "really hurts our country and it really hurts our relationship with Russian Federation".
Citing the alliance's Secretary-General, Jens Stoltenberg, he said, "Secretary Stoltenberg gives us total credit, meaning me, I guess, in this case, total credit".