The Zika virus is spreading to North America, and U.S. delays in approving research and funding could lead to a public health disaster, write Larry Brilliant and CFR’s Laurie Garrett.

The process that led to South Sudan’s independence offers lessons for avoiding a new, devastating conflict in the region and underscores the importance of sustained and vigorous U.S. diplomacy, write…

Greece teeters more than ever on the brink of a eurozone exit, a move that carries far greater consequences for Western interests than severing the monetary union, says CFR’s Sebastian Mallaby.

At its Warsaw summit, NATO should try to find better solutions to the problem of burden-sharing and a more sustainable strategy for managing tensions with Russia, writes CFR’s Stephen Sestanovich.