He also had strong words for Trump's rhetoric over Muslims in the wake of terrorist attacks, saying - using another acronym for ISIS - that Trump "is ultimately helping do ISIL's work for us".
Trump's mere musing that he would review allies' financial contributions in this case those owed by Estonia, Latvia and Lithuania before acting under NATO's Article 5 mutual defense clause if they were attacked by Russian Federation could rock the foundations of the security architecture that has underpinned European stability since the end of World War II.
Kalnins took to Twitter to mock Trump's remarks. According to a statement released by Jake Sullivan, the senior foreign policy adviser to the former secretary of state, Trump has deceptively shown that the U.S. can not advance its interests and values around the world as it lacks the moral authority to do so. The Washington conference was told by Brett McGurk, the United States special envoy on countering Isis, that the capture of Mosul was the ultimate test for the coalition.
"Regardless of who will be the president of America, we will trust in America", Lithuanian President Dalia Grybauskaite told reporters in Vilnius. "It has always defended nations under attack". Another factor, he said, was "personal discipline in terms of doing your homework, and knowing your subject matter, and being able to stay focused".
Responding to Trump's suggestion that his decisions would depend in part on whether states that were attacked were meeting their financial commitments to the alliance, former diplomat Richard Haass, president of the Council on Foreign Relations, said it is important not to see North Atlantic Treaty Organisation or any alliance exclusively in budget terms.
"What John Kerry said to me, a week ago, when I got this job, is what he and the Americans were wanting to see was more United Kingdom, not less UK".
If the Baltic states failed to contribute more, "Yes, I would be absolutely prepared to tell those countries, 'Congratulations, you will be defending yourself, ' " he said.
Sullivan noted that Trump has a "bizarre and occasionally obsequious fascination" when it comes to Russian President Vladimir Putin.
When asked whether he would provide military aid to the Baltic countries if Russian Federation were to attack, Trump replied, "If they fulfill their obligations to us, the answer is yes". Of the three Baltic states, only Estonia now meets that requirement, although Latvia and Lithuania drastically increased defense spending since Russia's 2014 annexation of Crimea, and both hope to meet it by 2018.
"I will not interfere in the US election campaign, but what I can do is say what matters for NATO", NATO Secretary General Jens Stoltenberg said. If we start putting conditions on defending each other, then the treaty is worthless.
Retired Adm. James Stavridis, the former NATO Supreme Allied Commander who has been rumored to be a potential vice presidential choice for Hillary Clinton, tweeted that Trump's NATO comments would bring "great cheer in the Kremlin". To someone like Vladimir Putin, who has been testing NATO's resolve with his exploits in Crimea and Ukraine, this could be a risky enticement to further adventurism.
Republican presidential candidate Donald Trump, center, gives a thumbs up as he talks with production crew during a walk through in preparation for his speech at the Republican National Convention on Thursday in Cleveland.
The campaign of Hillary Clinton, the presumptive Democratic nominee, pounced on Trump's remarks as another indication that he was unfit to lead.
Conservative foreign policy columnist Eli Lake: "Today it's the Republican nominee who would let Putin get away with an invasion of Ukraine".
"NATO is the most important military alliance in world history".