"We're supposed to be guarding against Russia and Germany goes out and pays billions and billions of dollars a year to Russia", Trump said in the presence of reporters at a pre-summit meeting at the residence of the USA ambassador to Belgium.
Germany, one of America's closest allies, is doubling its energy imports from Russia's Gazprom just as the US continues to spend billions of dollars to protect Germany and the rest of Europe from Russian Federation.
"Former Secretary of State John Kerry issued a scathing statement about what he called a "disgraceful", "disgusting" and downright "strange" appearance by President Trump at the North Atlantic Treaty Organisation summit in Brussels".
"He suggested that countries not only meet their commitment of 2% of their GDP on defence spending, but that they increase it to 4%", Sarah Sanders told reporters. The top US diplomat, who once served as a tank commander in Europe patrolling the Warsaw Pact frontier, sat stoically as Trump lectured NATO Secretary General Jens Stoltenberg over breakfast.
"Based on our agreed approach of doing nothing on Ukraine without Ukraine, I wish Mr Trump well in his efforts to bring Mr Putin back into line".
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Despite the friendly rhetoric, U.S. -Russia relations have soured since Trump's presidency.
During a working breakfast that marked the start of the summit, Trump claimed Germany is "controlled" by Russian Federation due to an energy partnership between the two countries.
Trump, who has long criticised Berlin for not spending enough on NATO's mutual defence and for alleged unfair trade practices noted Germany's "tremendous success".
Trump's White House spokeswoman Sarah Sanders confirmed the ask to reporters, claiming that it was not a new position for the USA president.
According to the declaration, all Allies have started to increase the amount they spend on defense in real terms and some two-thirds of Allies have national plans in place to spend 2 percent of their Gross Domestic Product (GDP) on defense by 2024.
"I grew up in the part of Germany that was not free, the German Democratic Republic".
Kerry responded with a lengthy statement Wednesday, calling Trump's missives against United States allies "disgraceful" and "destructive".
Stoltenberg estimated European allies and Canada will add $266 billion to their military spending by 2024 and said, "this is really adding some extra momentum", apparently meaning Trump's pressure.