A local speaks to Estonian army soldiers as they attend the Spring Storm military exercise near the country's eastern border in Rapina, Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Lithuanian army soldiers attend the Spring Storm military exercise near the Estonia's eastern border in Rapina, Estonia May 13, 2016. (Photo by Ints Kalnins/Reuters)





Estonian army soldiers train for urban fighting during the Spring Storm military exercise near the country's eastern border in Rapina, Estonia May 13, 2016. (Photo by Ints Kalnins/Reuters)





Estonian army soldiers train for urban fighting during the Spring Storm military exercise near the country's eastern border in Rapina, Estonia May 13, 2016. (Photo by Ints Kalnins/Reuters)





Lithuanian army soldiers attend the Spring Storm military exercise near the Estonia's eastern border in Rapina, Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Locals look on as Estonian army soldiers perform during the Spring Storm military exercise near the country's eastern border in Rapina Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Lithuanian army soldiers attend the Spring Storm military exercise near the Estonia's eastern border in Rapina, Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Locals look on as Estonian army soldiers perform during the Spring Storm military exercise near the country's eastern border in Rapina, Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Estonian army soldiers train for urban fighting during the Spring Storm military exercise near the country's eastern border in Rapina, Estonia, May 13, 2016. (Photo by Ints Kalnins/Reuters)





Estonian army soldiers train for urban fighting during the Spring Storm military exercise near the country's eastern border in Rapina, Estonia May 13, 2016. (Photo by Ints Kalnins/Reuters)





An instructor helps students of the General Yermolov Cadet School to prepare before a parachute jump from an airplane at an airdrome in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





An instructor helps a student of the General Yermolov Cadet School to prepare before a parachute jump from an airplane at an airdrome in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





A student of the General Yermolov Cadet School reacts as she waits to board an airplane for a parachute jump at an airdrome in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





A student of the General Yermolov Cadet School walks through a field after a parachute landing in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





Students of the General Yermolov Cadet School are seen after jumping with parachute from an airplane in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





Students of the General Yermolov Cadet School wait to board an airplane for a parachute jump at an airdrome in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





A student of the General Yermolov Cadet School is pictured after jumping with parachute from an airplane, as the moon is seen in the sky, in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





Students of the General Yermolov Cadet School board an airplane for a parachute jump at an airdrome in the village of Novomaryevskaya outside the southern city of Stavropol, Russia, May 13, 2016. (Photo by Eduard Korniyenko/Reuters)





Houthi militants perform the scene depicting a fake detention of a U.S. soldier during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Houthi followers shout slogans during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Followers of the Houthi movement hold up their rifles during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa May 13, 2016. (Photo by Khaled Abdullah/Reuters)





A Houthi follower sports a poster of the Houthi movement's founder, Houssein Badruddin al-Houthi, during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Houthi followers hold up a traditional dagger, “Jambiya” during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Followers of the Houthi movement perform the traditional Baraa dance during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Houthi followers hold up their rifles as they shout slogans during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





A boy with his face coloured with Yemen's national flag, attends a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. The headband reads, “We are steadfast against the aggression”. (Photo by Khaled Abdullah/Reuters)





Houthi followers shout slogans during a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. (Photo by Khaled Abdullah/Reuters)





Boys with their faces coloured with Yemen's national flag, attend a demonstration against the U.S. intervention in Yemen, in the country's capital Sanaa, May 13, 2016. The headband reads, “We are steadfast against the aggression”. (Photo by Khaled Abdullah/Reuters)