(VOVworld) - Speaking in Warsaw at the end of a NATO summit, US President Barack Obama said in good times and in bad, Europe can count on the US– always.

President Obama in Warsaw on Saturday at a NATO summit meeting with, from left, Prime Minister Matteo Renzi of Italy, Prime Minister David Cameron of Britain, President Petro O. Poroshenko of Ukraine, Chancellor Angela Merkel of Germany and President François Hollande of France. CreditStephen Crowley/The New York Times

 Obama said NATO was at a "pivotal moment” in which it is facing a range of challenges all at once, security, humanitarian, and political issues. He cited the threat from the Islamic State, refugee crisis, and the Britain’ vote to leave the EU, which have stoked fears about the EU’s future.

President Obama pledged the commitment of the US to the security and defense of Europe while warned that NATO allies had to do their part too, especially devoting two percent of annual economic output to defense spending.