At the NATO summit in Chicago, the much hoped-for deal between the United States and Pakistan to reopen NATO supply routes through Pakistan did not materialize. The experience of the closure and the negotiations has laid bare the changed relationship between the U.S. and Pakistan.

The United States and its allies and partners must not only understand Iran’s regional strategy and influence but also develop a coherent strategy of their own with which to confront them. Considering the relative economic, political, and diplomatic power of the two sides, it is unacceptable for the United States and its allies to allow Iran even such progress as it has made in these realms.

NATO is a defensive alliance dedicated to deterring and, if necessary, defeating aggression.

U.S. under secretary of defense for policy Michèle Flournoy will deliver an address on the new Afghanistan policy.

After the collapse of the Soviet Union, Ukraine, a country of 50 million people, was seen as a crucial bulwark against any resurgence of Russian territorial expansionism. That honeymoon period was short-lived. In November, following the apparent sale of "Kolchuga" radar systems to Iraq and other scandals, President Leonid Kuchma...

The Obama administration should act multilaterally to bring humanitarian relief, suspend diplomatic relations, and work with local authorities in Libya's liberated cities.

The absence of clear U.S. leadership on Libya has produced the current impasse, both diplomatically and militarily. Although NATO should ultimately prevail, it is wrenching that our president has caused so many of the problems we now confront.