Trump claimed victory for allies pledging "additional funds at a level that nobody's ever seen before".
Trump's biggest target for criticism, Germany, predicts that it will be spending 1.5 per cent of GDP on its military budget by 2024.
And while the president has said he ultimately wants to up commitments doubled to 4 percent, for now he said that countries have agreed to move at a "faster clip" to meet the 2 percent threshold. "After we're at 2 percent, we'll start talking about going higher".
Trump brushed off the protests, saying, "I think they like me a lot in the United Kingdom".
When asked if he was anxious that the Putin-Trump meeting could have negative consequences for Poland, Duda said he expected Trump to continue the US stance of supporting Poland. German Chancellor Angela Merkel on Wednesday gave Trump an uncharacteristically personal response, reminding him that she knew what captive means, having grown up in Soviet-controlled East Germany.
He continued the attack Thursday, complaining that, "Germany just started paying Russian Federation, the country they want protection from, Billions of Dollars for their Energy needs coming out of a new pipeline from Russian Federation". Demonstrators say that hundreds of thousands of people are planning to take to the streets tonight and tomorrow, and are planning to float a giant balloon caricature of Trump outside Parliament.
From Brussels, Trump heads to England, where May's government is in turmoil over her plans for exiting the European Union.
Other NATO leaders emphasized their public support for the alliance, implicitly pushing back on Trump's attacks.
Macron, in his own news conference, seemed to reject Trump's claim that North Atlantic Treaty Organisation powers had agreed to increases beyond previous targets.
"Because of me they've raised about $40 billion over the a year ago".
"I think it's very sad when Germany makes a massive oil and gas deal with Russia, where you're supposed to be guarding against Russia, and Germany goes out and pays billions and billions of dollars a year to Russia", Trump told Stoltenberg earlier Wednesday.
The President's remarks sent officials scrambling for answers, triggered ripples of dismay among defense officials and alarmed members of Trump's own party enough that one anxious aloud the President is trying to "tear down" the 29-member alliance.
The new German ambassador to the U.S. conveyed some of the simmering unease in her country and beyond during a Wednesday interview with CNN's Wolf Blitzer, when he asked whether her country thinks Trump would honor Article 5, the alliance commitment to come to a member's aid if they're attacked.
NATO Secretary General Jens Stoltenberg on Thursday told CNN that the organisation's member countries have committed to defence spending at two percent of GDP, but would not confirm US President Donald Trump's claim that the target was actually four percent. USA defense spending accounts for roughly 67% of this, but it's also true the United States has the highest defense budget in the world by far and this is linked to both its strong economy and internal politics.
'The question [is] can they make it because they are doing very well, can they make it for so many people.
As a strong proponent of diplomacy, I believe a meeting between President Trump and President Putin could be a productive one.
In May the United States pulled out of a multinational deal to lift sanctions against Iran in return for curbs to its nuclear program. This NATO source suggested that Trump will go into his meeting with Putin with a stronger hand if the NATO alliance is also strong. And one of the freedoms we have is freedom of speech and the freedom to express your views. "I'm a very stable genius".
He also said meeting the queen would be an experience Trump "will really cherish".