Gregory Koblentz weighs the U.S. foreign policy options toward Iran.

Gregory Koblentz argues that the United States' best option for a response to the conflict in Syria is not simply arming the rebels, pushing for UN sanctions, indicting Assad, or pressuring Russia—rather, it is a combination of all four.

Some argue that the best way to restrain North Korea is to strengthen sanctions, principally by putting more pressure on China to reduce its trade with North Korea. Others advocate a diplomatic approach and argue that engagement, not escalation, would be more effective. What all parties need to remember is that actions speak louder than words.

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The success of a UN investigation into an alleged chemical weapons attack in Aleppo province last week will depend on a number of factors and could prove inconclusive, says CFR's Gregory Koblentz.