"Dear America, appreciate your allies, after all you don't have that many", Donald Tusk said after signing a joint European Union-NATO declaration on cooperation with alliance Secretary-General Jens Stoltenberg in Brussels.
"Many of us are concerned - I certainly am - about the president's ongoing rhetoric that really demeans or ridicules our allies and praises our adversaries", Flake said. "Frankly, Putin may be the easiest of them all".
That Trump will be meeting with Vladimir Putin nearly immediately thereafter, however, has North Atlantic Treaty Organisation nations taking a lot more notice, and diplomats predicting Trump will make threats to redraw the security landscape in Europe if North Atlantic Treaty Organisation doesn't give him what he wants.
And he described as "stupid people" the unnamed Trump administration officials whom the Russian president said had tried to prevent the call from happening, according to a person with direct knowledge of the conversation. "I think that getting along with Russian Federation, getting along with China, getting along with others, is a good thing, not a bad thing".
Besides Brussels, Trump's trip will also take him to London, where Prime Minister Theresa May's government is in turmoil over her plans for exiting the European Union.More news: Microsoft Surface Go is available for pre-order
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Trump, who has compared the sentiment that underpinned the Brexit vote to leave the European Union to his own election, will be making his maiden presidential trip to Britain at a fraught time for May.
The meeting will be closely watched to see whether Trump will rebuke or embrace Putin, who has repeatedly denied the allegations of election meddling, in spite of evidence to the contrary. "We lost $151 billion previous year on trade", the president told reporters.
"Dear @realDonaldTrump. US doesn't have and won't have a better ally than EU. But above all when you meet President Putin in Helsinki" on July 16.
On other occasions, the two men discussed Syria, where Putin offered to help Trump achieve his agenda of pulling the USA out of the region, before advisers urged the President not to accept such an offer. In the past few weeks, Trump has sent sharply worded letters to the leaders of several European countries, including Germany, Italy and Norway, and also to Canada, warning that the US was losing patience. "Charge us big Tariffs (& Barriers)!" the President tweeted on Tuesday before six in the morning. Trump said might meet with Johnson in the United Kingdom despite his resignation.