"In good times, and in bad, Europe can count on the United States. Always," Obama said after a NATO summit in Warsaw approved the alliance's biggest military upgrade since the end of the Cold War in response to Russia's intervention in Ukraine.

The president said NATO was at a "pivotal moment" in the face of threats from the Islamic State group, the crisis in Ukraine, Europe's biggest migrant influx since the end of World War II and finally Britain's vote to quit the European Union which had stoked growing fears about the continent's future.

"In this challenging moment, I want to take the opportunity to state clearly what will never change. And that is the unwavering commitment of the United States to the security and defense of Europe," he said.

At the same time, Obama, attending his final NATO summit, warned that allies had to do their part too and meet a commitment to devote at least two percent of annual economic output to defence spending.

"The majority of allies are still not hitting that two percent mark ... so we had a very candid conversation about this," he said.
NATO chief Jens Stoltenberg said earlier there were no differences among the 28 leaders over how to counter a more resurgent Russia.
"The alliance is united, we stand together ... The united message is that defence and dialogue are what our relationship is based on."
Some of the allies however, especially France and Germany, have called for NATO to avoid a Cold-War style stand-off with Russia.
But unity was the buzzword at the two-day summit after the Brexit vote shocked the allies and raised questions about Britain's future as a nuclear armed global power.
Prime Minister David Cameron said he had reassured his peers that Britain was committed to them and NATO, and announced a parliamentary vote on July 18 on revamping Britain's Trident nuclear deterrent to back that up.

"The nuclear deterrent remains essential in my view, not just to Britain's security but as our allies acknowledge here today to the overall security of the NATO alliance," Cameron told a news conference.


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