After waiting out an early-afternoon downpour, Vice President Joe Biden and the U.S. delegation emerged into the humid heat to tour the $5.2-billion canal expansion. Baltimore Mayor Stephanie Rawlings-Blake snapped pictures with her cellphone. Philadelphia Mayor Michael Nutter beamed with curiosity as he walked and questioned a site supervisor.

Nicaragua has authorized the militaries of the United States and Russia to undertake drug interdiction in Caribbean waters successfully claimed from Colombia in the International Court of Justice last year, in a move likely spurred by political motivations.

The Canadian embassy in Washington, D.C., opened its doors last week to the city’s digital diplomats for an event where they could brag about their use of social media and pick up some tips. A dozen embassies and international organizations, including the World Bank and European Union delegation, participated in the “Digital Diplomacy Open House” that was held in partnership with the Digital Diplomacy Coalition.

Numerous governments and citizens throughout the world would like to see an effective counterbalance to China in East Asia. Korea, with its commitment to democracy, sophisticated economy, and long-established ties to the United States and other Western countries, is in a strong position to play this role, if it chooses to do so.

Emergency relief provided by U.S. troops in areas devastated by typhoon Haiyan in the central Philippines makes a strong case for the two allies to clinch a new military accord, Manila's foreign minister said on Monday. The Philippines and the United States have been negotiating a new security agreement allowing wider and more prolonged access for the U.S. military at bases and other facilities in its former colony. It also provides for storage of equipment and supplies for humanitarian and maritime operations.

The potentially landmark agreement struck between Iran and world powers over Tehran's nuclear program, after five days of talks in Geneva, was first officially announced on Twitter. It was Michael Mann, the spokesman for EU foreign policy chief Catherine Ashton, who broke news of the deal on Twitter while quoting his boss.

In a victory for diplomacy, world leaders announced early Sunday that a deal had been struck with Iran over its disputed nuclear program. In what U.S. President Barack Obama called an "important first step" toward addressing the world's concerns over Iran’s motivations and actions and opening a path out of a three-decade long standoff, the deal will curb Tehran’s nuclear ambitions away from a bomb and toward a civilian capability, in exchange for limited relief—for now—from strict sanctions that have devastated the Iranian economy.