In an interview published on Tuesday, Secretary General Stoltenberg said he The alliance will respond to any attack against Poland or the Baltic countries. It was not clear why Turkey reversed course but the move came as Mr Erdoğan held an unscheduled meeting with Donald Trump. "We can't let that happen", Trump said of transatlantic disputes on issues ranging from the aerospace sector to a European digital services tax on USA technology giants.
Republican US Senator Lindsey Graham and Democratic Senator Chris Van Hollen called on the Trump administration on Monday to impose sanctions on Turkey over its purchase of the Russian system, saying the failure to do so sends a "terrible signal" to other countries.
"They've been very good".
'We have tripled the size of the North Atlantic Treaty Organisation defence force which can be reinforced if needed, invested in high end capabilities, stepped up in the fight against terrorism with a new training mission in Iraq and European allies are investing more in defence'.
The White House said in a statement, "The two Presidents discussed the importance of Turkey fulfilling its alliance commitments, further strengthening commerce through boosting bilateral trade by $100 billion, regional security challenges, and energy security".
Hong Kong leader says new United States law, violence will harm economy
China's Foreign Ministry condemned the new law, calling it nothing more than a show of public support for "violent criminals". A so-called "phase one" deal between the world's two largest economies had originally been expected by the end of November.
Trump later softened his tone at a joint appearance with Macron, but the French leader stood by his approach - and his choice of language - and turned his guns on Turkey.
President Recep Tayyip Erdogan found himself at odds with some allies recently when he ordered a military incursion into Syria targeting Syrian Kurdish militias along the border.
The defense plans for the Baltics and Poland, who claim they are threatened by Russian Federation, were in limbo after Turkey pledged to block them unless the alliance backs its incursion in Syria and labels Kurdish-led militias a "threat" and designates the biggest group - the People's Protection Units (YPG) - as a terrorist organization.
Merkel said she was "relatively optimistic" after the meeting, but Macron warned that "not all clarifications were obtained and not all ambiguities were resolved". "The two presidents agreed to meet during the summit in the presence of Baltic state officials".