China’s leader, Xi Jinping, is seeking to deepen ties with a longtime U.S. security partner and to project a larger role for Beijing in a region rocked by war.

Amid a crew morale crisis, the military has replaced the U.S.S. Abraham Lincoln in the Middle East with another aircraft carrier. Our Pentagon reporter John Ismay, a Navy veteran, explains how the challenges to supply ships in the area will most likely remain the same.