Ukraine’s intensifying crisis has the Obama administration hinting at tougher sanctions against Russia, which could threaten Moscow’s ability to trade and invest, says CFR’s Robert Kahn.

A top New York City police official and author of a new book on al-Qaeda, Mitchell Silber, discusses with CFR’s Ed Husain the persistent threat of a homegrown U.S. radical mounting a terrorist attack.

The U.S.-Saudi relationship has become increasingly strained since the onset of the Arab awakening, and Iran’s nuclear ambitions could pose further challenges, says expert F. Gregory Gause III.

Talks over Iran’s nuclear program have concluded with a deal that will limit Iran’s nuclear capabilities in exchange for relief from economic and financial sanctions. Before the sanctions are lifted,…