Trump also rejected the joint communique signed by leaders at the conclusion of the meeting, launching personal attacks against Canadian Prime Minister Justin Trudeau in the process.
Jon Huntsman, U.S. ambassador to Russian Federation, said that Mr. Trump wants to improve bilateral relations but does not intend to let Mr. Putin off the hook for aggression in Ukraine and interfering in the 2016 U.S. presidential election.
Fifteen members of North Atlantic Treaty Organisation are on track to meet the pledge to spend two percent of their GDP on defense by 2024, and "every one of our allies - 100 percent - are increasing defense spending, so that's something we will talk about as an achievement, but we have to do more", she added.
Mr. Trump's political opponents in the USA will be looking for any sign that the president goes easy on Mr. Putin, which they would say bolster allegations of Trump campaign collusion with Moscow to hack the 2016 presidential election.
Trump will enter the July 16 meeting in Helsinki with "eyes wide open" to assess whether Putin wants to improve relations, Ambassador Jon Huntsman said Thursday on a conference call with reporters.
"The overall theme of this summit is going to be NATO's strength and unity", Hutchison said. "The United States is not going to take care of everything, '" Trump told his supporters in Montana, broadcast live on CSPAN.
"Germany, which is the biggest country of the EU, European Union, Germany pays 1 percent, 1 percent", Trump said.
"A change in atmosphere can change a whole lot else", the official said.
Jorge Sampaoli: Lionel Messi is the coach
We need to know how to play with him and be able to work with him on the pitch, some of them can do it quickly and others not. Federation Internationale de Football Association said it had no plans to change its fair play criteria.
Mr. Huntsman said the USA has repeatedly confronted Russian Federation about the election hacking, despite Mr. Trump frequently diminishing the issue and repeating Mr. Putin's own denials of meddling.
Just last week, he trumpeted a Putin talking point, tweeting: "Russia continues to say they had nothing to do with Meddling in our Election!"
"You appear to be hell-bent on pushing for your European army, hell-bent for a foreign policy without veto, and hell-bent to be on a direct collision course with President Trump, and with NATO", Farage said on Tuesday while blasting the EU leadership during a debate at the European Parliament.
Huntsman cited Trump's meeting last month with North Korean leader Kim Jong Un as having "reduced tension on the Korean Peninsula", and said that any reduction in tension with Russian Federation "would be on a much bigger scale". "And that will all be possible during this meeting format".
"They kill us", he said.
"Will I be prepared?"
"I might even end up having a good relationship" with Putin, said the real estate mogul, who also denounced "75 percent" of journalists as "downright dishonest".