Mistrust between Western powers and Russia rivals the worst days of the Cold War, raising the dangerous prospect of escalating tensions between the two sides, says expert Dimitri Simes.

The new agreement between Iran does not resolve the problem and complicates U.S. relations with regional allies, says CFR President Richard N. Haass.

Governments’ refusals to entertain the possibility of dialogue with groups such as al-Qaeda and the self-proclaimed Islamic State causes needless deaths, says expert Jonathan Powell.