"In some ways, we are solving a non-existent problem because we can't solve the existing ones," a Western defense official, speaking on condition of anonymity, said as the 28-nation summit ended on Friday.
The flight from Afghanistan to Dubai, carrying U.S. military personnel, landed in Iran after officials there questioned its flight plan.
Obama also said in a speech in Wales on Friday that NATO would implement a readiness action plan to monitor the situation in Ukraine.
The U.S. has killed the mastermind behind the most prominent Islamist terror group in Somalia.
The organization has said it will now take its jihad to India, Myanmar, Bangladesh and other regions where Muslims are oppressed.
A Twitter account belonging to the Russian Embassy in the United Arab Emirates has trolled the NATO summit with a sarcastic tweet.
The president has asked allies to increase military spending to 2 percent of GDP, but that's not a realistic target in today's economy.
Rasmussen's comments stepped up Western rhetoric against Moscow and set the tone for the two-day meeting.
Since the rise of Islamic State, and the emergence of Islamist groups in Africa and elsewhere, al-Qaeda's clout among jihadists has been waning.
After Steve Sotloff was beheaded by ISIS militants on Tuesday, Congress appears to be warming to U.S. military action in Syria.
The northern French port town has seen a flood of immigrants fleeing war and famine, and trying to get to the UK.
American journalist Steven Joel Sotloff has been beheaded by ISIS, according to a nearly three-minute video that shows his death.
NATO Secretary General Anders Fogh Rasmussen says a build up of forces in Eastern Europe is necessary to guard against Russian aggression.
Pakistan has been gripped by unrest for more than two weeks, with protest leaders saying they will not back down unless the Prime Minister resigns.
The attack took place in Jalalabad, which is located near the border with Pakistan,is one of the country’s most troubled regions.
While ISIS takes the spotlight, the Taliban has launched a campaign in Afghanistan to retake the land it lost to Western troops - and Obama may be forced to respond.
The move is sure to rile up Russia, which is under increasing international pressure to end its direct support of pro-Russian separatists in eastern Ukraine.
U.S. officials said they are close to forming an international coalition to fight ISIS, reminiscent of the beginnings of the war on terror.
Two aircraft types - a Cold War veteran and a drone - have been charged with hunting down ISIS in Syria after President Obama authorized surveillance flights.
The audit has been interrupted at a crucial time as outgoing president Hamid Karzai has insisted that his successor be inaugurated next week.
The 26-year-old woman was abducted last year while on a humanitarian aid mission in rebel-held Aleppo.
The end of a decade of war brings a large drop in workers at America's biggest defense companies. But the cuts may be over soon.