TOPSHOT-SKOREA-US-DEFENCE-MILITARY-EXERCISE

TOPSHOT - South Korean and US soldiers take a position during an annual joint military landing exercise in Pohang, on South Korea's southeast coast, on March 12, 2016. Participation in the joint exercises -- known as Key Resolve and Foal Eagle -- has been bumped up this year to involve 300,000 South Korean and around 17,000 US troops, as well as strategic US naval vessels and air force assets. Pyongyang has long condemned the drills, which stretch over nearly two months, as provocative rehearsals for invasion, while Seoul and Washington insist they are purely defensive in nature. (Photo by Ed Jones / AFP) (Photo by ED JONES/AFP via Getty Images)