North Atlantic Treaty Organization (Nato)

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Both President Obama and British Prime Minister David Cameron (right) have stepped up their rhetoric on the Islamic State group this week, and are hoping to rally international support for defeating the terrorist organization while attending the NATO summit. (Associated Press)

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President Obama spoke in Estonia about the need for NATO to defend its member states, many of whom are wary of Russian incursions similar to what has occurred in the Ukrainian theater. (Associated Press)

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President Obama traveled last year to Estonia, where he tried to reassure NATO members of the alliance's promise to defend against Russian aggression under President Vladimir Putin. (Associated Press)

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NATO Alliance Illustration by Greg Groesch/The Washington Times

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200 oil tanker trucks supplying fuel for NATO forces were set ablaze by Taliban militants outside the Afghan capital Kabul, July 5, 2014. (Image: Chicago Tribune video screen shot)