"The concerns about Russian Federation, the concerns about threats to the alliance were met with solidarity and unity", he said, "and we are looking forward to a good meeting and a productive and constructive meeting between President Putin and President Trump". Probably not much, as the USA contributes between one-fifth and one-quarter of NATO's annual budget of about $2 billion.
A senior USA administration official, though, said Trump was aggressive while meeting in private with the leaders of the North Atlantic Treaty Organisation alliance, and said the United States will have a "reassessment" of commitments to the allies unless their defense budgets were raised, notes NBC.
In the piece, Trump said he advised May on how to handle the exit from the European Union and said he "would have done it much differently".
"That is all", Macron said.
After throwing hand grenades for a day-and-a-half behind the scenes, insulting allies, and questioning the military alliance's very reason for being, the media was preparing for Mr Trump to do the same in a formal press conference - albeit hastily arranged.
When asked how he planned to fix the situation, Trump said: "If I knew, I wouldn't tell you, because that would put us at a disadvantage". Trump: "The additional money that they're willing to put up has been really wonderful ... " They're happy to do it.
Sources told NBC that Trump's insistence on more spending was accompanied with a threat that the USA would "do our own thing" if his demands were not met.
With that, Trump moved on to the United Kingdom, where significant protests against him were expected.
An afternoon march and rally in central London was attended by tens of thousands of protestors.
On Friday, Donald Trump launched a scathing attack on Theresa May's Brexit proposals in an explosive interview, claiming the Prime Minister's White Paper could jeopardise the future trading relationship between the United Kingdom and the US. "I don't know that is what they voted for".
Then he quipped: 'There won't be a Perry Mason here, I don't think.
At NATO, Trump did not specify which countries had committed to what, and it remained unclear whether any had changed their plans. That would mark a significant milestone for the alliance. "The current commitment is to reach two percent by 2024 but with get-out terms that would allow some to stretch it out to 2030".
When pressed to explain Trump's claims he credited the president with a "new sense of urgency" among allies to "redouble our efforts" to increase defence spending, but did not report any new cash or time commitments.
"But it is too bad what is going on".
"We're protecting Germany, we're protecting France, we're protecting all of these countries".
Trump has said next week's meeting with Putin "may be the easiest" part of his European tour.
"We have this stupidity going on, pure stupidity, but it makes it very hard to do something with Russia because, anything you do, it's like: "Russia, oh he loves Russia", Trump said.
This gives Putin, who invaded the Ukrainian territory of Crimea in early 2014 without major reaction from the West, even more leeway to shape the global balance of power despite its relative economic weakness versus major adversaries like China and the United States.