The US president called Macron's "brain dead" remarks on NATO "nasty," saying he could see Paris leaving the military alliance. The comments set the tone for what is expected to be another tense summit among NATO allies.
What Trump said on NATO:
Speaking to the press on the summit's sidelines, Trump:
How Macron responded:
NATO expansion threat to Russia
Meanwhile, Russian President Vladimir Putin said his country was open to cooperation with NATO.
"We have repeatedly expressed readiness to jointly resist real threats including international terrorism, local armed conflicts (and) the danger of uncontrolled proliferation of weapons of mass destruction," Putin was quoted by Russian news agencies as saying.
Speaking at a meeting of military leaders in the Russian resort of Sochi, Putin criticized the alliance's continued expansion, which he said posed a threat to Russian security.
He also argued that NATO was outdated, saying "bloc stereotypes of thinking of previous years cannot be an effective tool for seeking and taking effective decisions in the fast-changing conditions of the modern world."
'No deadline' on China trade deal
Trump suggested that a long-awaited trade deal with China would have to wait until after the next US presidential election in November 2020 — with no end currently in sight to the ongoing trade war between Washington and Beijing.
"I have no deadline, no. In some ways I think it's better to wait until after the election with China," he told reporters.
US support for Turkey
Trump also defended his decision to pull US troops out of northern Syria and voiced his support of Turkish President Recep Tayyip Erdogan — who subsequently launched an offensive against Kurdish forces in the region.
"I like Turkey and I get along very well with the president," Trump said.
Ahead of the summit, Erdogan vowed to oppose a NATO plan to defend Baltic countries unless the alliance supports it in recognizing the Kurdish YPG militia as a terrorist group.
European leaders are due to question Erdogan at the summit over his actions in northern Syria.
The leaders of NATO's 29 members have gathered in London for a summit to celebrate the 70th anniversary of the founding of the transatlantic military alliance.
nm,rs/ng (Reuters, dpa, AFP, AP)