"Germany is a captive of Russia because it is getting so much of its energy from Russia", Trump said, taking particular aim at the proposed Nord Stream II gas pipeline, which he has previously criticised.
Ahead of this week's summit, Mr Trump has routinely urged other North Atlantic Treaty Organisation members to increase their military spending.
While countries closer to Russian Federation, such as Latvia, Lithuania, Romania, and Poland, significantly boosted defense, most other members took a more relaxed approach, with Germany's defense minister saying in 2015 that she didn't see a need to meet the spending bar, Deutsche Welle reported.
The United Kingdom, with its eye on Brexit, is most likely to side with Mr. Trump, said Michael C. Desch, director of the Notre Dame International Security Center. "I think that's very inappropriate".
His stance earned him a summit eve rebuke by EU President Donald Tusk who said that Trump should "appreciate" his allies and that the United States didn't have many.
But instead of trying to engage with what Trump actually said during the Fox News interview, Gardner pretended Trump actually meant the opposite of what he said.
Many US presidents have urged European governments to spend more on their militaries. Trump has praised Brexiteers and trashed the European Union in the past, and he piled on ahead of his first visit to Britain.
The NATO chief was frank about the impact of Trump's criticism on the organisation.
Italian Interior Minister Matteo Salvini even had some Trump-esque praise for Mr. Putin, whom he hoped to meet during a trip to Moscow for the Wold Cup final.
The president has lashed out at countries that fall short. "Will they reimburse the U.S.?" he said in one tweet.
He said the U.S. did not and would not have a better ally than the EU, reminding the president that European troops had also fought and died in Afghanistan after the 11 September 2001 attacks on the US.
Mr Trump predicted as he departed Washington that the "easiest" leg of his journey would be his scheduled sit-down with Mr Putin.
"But how can you be together when you're getting energy from the group you want protection from?" the president asked.
Last month, Austrian President Alexander Van der Bellen said that while U.S. politicians are accusing Europe of being dependent on Russian gas, Washington was force-feeding Europe its liquefied natural gas, which is three times more expensive than natural gas from Russia.
The 1.5 percent level forecast for NATO's European members in 2018 compares to 1.46 percent a year ago, 1.44 percent in 2016 and 1.42 percent in 2015.
"Il est vrai qu'après le G7, dont Donald Trump s'est désolidarisé, tout le monde attend ce que va faire le président américain". Le président américain se rend au siège de l'OTAN , puis à Londres, cette semaine, avant un sommet avec Poutine.
Investors are also keen for details on Erdogan's new economic team, which is expected to be announced later on Monday. The lira on Tuesday gained back 0.5 percent against the dollar to trade at 4.7 to the greenback.
The drama in Thailand has even resonated as far as Russian Federation , where soccer's World Cup is reaching its final stages. They underwent X-rays and blood tests and will remain under observation in the hospital for at least seven days.
France is back in the World Cup final for the first time since Zinedine Zidane's headbutt in 2006. "I don't have the words". We had the chance to win the final of the Euros, but we missed a wonderful thing and we must not let this chance pass.
Photographs taken by someone passing the scene showed the car's front right bumper damaged and Clooney's bike on its side. The car's driver assisted George after the crash and reportedly called an ambulance, according to NBC .
Leaning against a handrail next to New York City's East River, the duo wrapped their arms around each other in front of parkgoers. A New York City stroll - what could be more romantic? Justin Bieber and Hailey Baldwin have sealed their re-romance with a kiss.
The alleged offenses took place before the roll out of new European Union data protection laws that allow for much larger fines. The decision was welcomed by former Cambridge Analytica employee and whistleblower Christopher Wylie.
Facebook to be fined £500,000 over data breaches
A Facebook spokeswoman said the company was cooperating fully with an investigation by Australia's privacy commissioner. Mail.Ru told CNN it had not been contacted by Facebook about its investigation into the misuse of user data.
China: Liu Xia free and on her way to Germany
As she got off a plane in transit at the airport in Helsinki, she spread her arms and grinned widely at a waiting photographer. "Only by taking medication can I fall asleep and stop looking at this painful world", she said, according to Ye.
Klopp plays down Karius mistake
Two brilliant footballers make this mistake, which one was the bigger? On the match, Klopp continued: "Apart from the goals [conceded] everything was pretty much good".
Sophie Gradon's Boyfriend Aaron Armstrong Dead at 25
According to police, there was no third-party involvement in the death, and a report is being prepared for the coroner. Amber Davies, victor of 2017's Love Island also offered her condolences, tweeting: "Awful news".
Les Belges taillent les Bleus !
Chacun joue avec ses moyens, en fonction aussi des qualités de l'adversaire. Sans pour autant être surpris du jeu proposé par les Bleus.
Arsenal sign Uruguay's Torreira for $48m
Arsenal are also close to completing another deal to land France Under-20 worldwide Matteo Guendouzi. Torreira claimed that he is looking forward to his new "adventure" in England.