Pilgrims pray in front of Kaaba and Putin in china

Pilgrims pray in front of Kaaba on the day they perform Tawaf at the Grand Mosque, ahead of the annual hajj pilgrimage, in the holy city of Mecca, Saudi Arabia, May 24

Marines hold the U.S. flag during an annual Memorial Day commemoration ceremony to honor the men and women who made the ultimate sacrifice while serving in the United States Armed Forces at the Intrepid museum in NewYork City May 25

Members of the honour guard stand after a welcoming ceremony hosted by Chinese President Xi Jinping and his wife Peng Liyuan for Serbian President Aleksandar Vucic and his wife, at the Great Hall of the People,China May 25

A Long March 2F rocket carrying the Shenzhou-23 spacecraft with astronauts Zhu Yangzhu, Zhang Zhiyuan, and Lai Ka-ying, blasts off to China's Tiangong space station from the launchpad at the Jiuquan Satellite Launch Center, May 24

Aircraft perform during an air show marking the 85th anniversary of the Battle of Crete, over the Venetian harbour in Chania, on the island of Crete, Greece, May 24

The Blue Angels perform a flyover at the start of the Graduation and Commissioning Ceremony at the U.S. Naval Academy in Annapolis, Maryland, U.S., May 22

A Palestinian looks through the doorway of a UNRWA school in the Maghazi area of central Gaza May May 20

Chinese People's Liberation Army (PLA) honour guards march during a welcome ceremony for Russian President Vladimir Putin at the Great Hall of the People in Beijing, China May 20

A man attaches name cards with wishes of Buddhist followers to lotus lanterns displayed at the Jogye Temple after a service to celebrate Buddha's birthday in Seoul on May 24

In this aerial view, fog rolls by the Golden Gate Bridge in San Francisco, California on May 20