American airports are now centers of elaborate security rituals.
In Siena (as you'll see in the photos at the end of this clip), the police were out in force, with busloads converging on the town center, lines of security troops checking anyone entering the square, and (of course) bars busy with heavily armed cops getting their cappuccino.
"He has undercut the United States position greatly," said I. M. Destler, director of the center for security and economy policy at the University of Maryland and one of the country's leading historians of trade negotiations.
"It's the heart and center of all security," said Talad Masood, a political analyst and retired Pakistani general.
"After being at the center of European security for 70 years, it's strange to hear that it is no longer a matter of U.S. concern".
The question of how close Iran is to being able to use a nuclear weapon has generated friction between the two leaders and will be at the center of their security discussions.
As new threats to American life have replaced cold war fears about nuclear war, many issues once considered "women's issues" have moved to the center of national security, and men often line up with women in giving them emphasis.
So you don't have to place a changing climate at the center of your security thinking in order to include it in a worldview that takes into account all changing sources of risk.
Whether it is computational propaganda, or fake videos, or private data leaks, artificial intelligence is increasingly at the center of the security and prosperity challenges facing the country.
In the center of Taiz, security forces used heavy artillery, including shelling and mortar attacks, against a neighborhood, Masbah, that is home to a powerful opposition military commander, Brig.
