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Saudi Foreign Minister Faisal bin Farhan Al Saud proposed a ceasefire for Yemen on Monday, speaking from Riyadh, the Saudi capital. Fayez Nureldine/AFP via Getty Images hide caption

A paramilitary police officer talks next to a screen showing frontier soldiers of the People's Liberation Army during an event at a primary school in Wuzhishan, Hainan province, China, on Feb. 22. On the screen are (L-R) Qi Fabao, who was seriously wounded in the border clash with Indian troops in June last year, and four who were killed: Chen Hongjun, Chen Xiangrong, Xiao Siyuan and Wang Zhuoran. China Daily/via Reuters hide caption

Roberta Jacobson, the White House coordinator for the southern border, addresses migration issues during a daily press briefing this month. Alex Wong/Getty Images hide caption

A landscape view seen in the Balukhali camp in Cox's Bazar, taken two years ago. A massive fire has swept through the camp, destroying hundreds of dwellings. Kazi Salahuddin Razu/NurPhoto via Getty Images hide caption

Some of the 220 Chinese vessels are seen moored in early March at the Whitsun Reef in the South China Sea. Philippine Coast Guard/National Task Force-West Philippine Sea via AP hide caption

Policemen wearing face masks patrol at the compound of No. 2 Intermediate People's Court in Beijing on Monday, as Canadian Michael Kovrig went on trial in a closed courtroom for espionage. Andy Wong/AP hide caption

Results from late-stage testing show the Oxford- AstraZeneca COVID-19 vaccine can be 79% effective at preventing symptoms of COVID-19. Finnbarr Webster/Getty Images hide caption

Researchers say they may have found a reason for a rare blood clotting condition that has occurred in some people who received the AstraZeneca COVID-19 vaccine. Anatolii Stepanov/AFP via Getty Images hide caption

Amin Nasser, president and chief executive officer of Saudi Aramco, speaks during the fourth edition of the Future Investment Initiative conference at the Ritz-Carlton hotel on Jan. 27, in Riyadh, Saudi Arabia. Fayez Nureldine/AFP via Getty Images hide caption

Lloyd Austin, U.S. secretary of defense, visits the National Cemetery in Seoul, South Korea, on Thursday. On his Asia tour, the defense chief made an unannounced visit to Afghanistan on Sunday. SeongJoon Cho/Bloomberg via Getty Images hide caption

U.S. Defense Secretary Lloyd Austin reviews an honor guard with Indian Defense Minister Rajnath Singh, in New Delhi, India on March 20, 2021. Austin arrived Sunday, in Kabul on his first trip to Afghanistan as Pentagon chief, amid swirling questions about how long American troops will remain in the country. Manish Swarup/AP hide caption

People without face masks attend a protest against government restrictions to curb the spread of the coronavirus in London on Saturday. Alberto Pezzali/AP hide caption

A female African lion, said to be similar to those discovered dead, is pictured in 2013. Ariel Schalit/AP hide caption

Travelers waited to flee Paris at the Montparnasse Train Station on Friday ahead of a new lockdown announced by the government in response to a surge in cases of the coronavirus. Julien Mattia/Anadolu Agency via Getty Images hide caption

A couple takes pictures with the Olympic rings monument near the National Stadium for the Tokyo 2020 Olympic Games on Feb. 4. Organizers have decided that overseas spectators won't be allowed to attend the Games this summer. Kazuhiro Nogi/AFP via Getty Images hide caption

Lava flows Saturday from the Fagradalsfjall volcano on Iceland's Reykjanes Peninsula. The long-dormant volcano erupted Friday evening. Icelandic Coast Guard/AFP via Getty Images hide caption

"There are not yet enough vaccine doses in Europe to stop the third wave by vaccination alone," German Health Minister Jens Spahn said Friday. Here, a health care worker displays a vial of the AstraZeneca COVID-19 vaccine in Stuttgart, Germany. Marijan Murat/Pool/AFP via Getty Images hide caption