"Dear America, appreciate your allies, after all you don't have all that many", he said.
Donald Tusk's comments come in light on the problems emerging between the European Union and US.
"European allies and Canada should not increase defense spending to please the United States", Stoltenberg said.
While some nations have taken that request (or demand) seriously and vowed to stick their hands deeper into their pockets, European Council President Donald Tusk cautioned the President: "it is always worth knowing who is your strategic friend and who is your strategic problem".
THIS SHOULD BE EASY: President Donald Trump and Russia's President Vladimir Putin talk during the family photo session at the APEC Summit in Danang, Vietnam November 11, 2017. But we'll work it out and all countries will be happy.
However, European officials say while USA defense spending makes up 70 percent of combined allied governments' military budgets, just 15 percent of US expenditure is spent in Europe on NATO-related defense. "Not fair to the US taxpayer", Trump said.More news: U.S. Navy warships sail through Taiwan Strait
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The meeting comes at a time of fraying relations across the European Union, so will anyone stand up to the US President? The EU did strike back with retaliatory tariffs on United States goods.
Furthermore, all member states contribute to NATO's overall budget based on their national income, with the U.S. providing about 22% of the budget. "Very Unfair!" he said in a second message.
Hodges said Europe needed more German trains than German tanks because the capability of transporting the armed forces was vital at present.
"I want to be clear: we're absolutely committed to the protection of our allies and to global peace and security", Trudeau said in Riga, adding that Canadian fighter jets would continue to take part in North Atlantic Treaty Organisation air policing mission in the Baltic countries.
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.
In Europe this year, four countries will meet the 2 percent target - compared with three last year - and another two nations will reach it if the figures are rounded up to one decimal place.
"In terms of a government who's radically rethinking the nature of its committeemen to Europe, the British are the closest to the Trump administration on those issues", he said.