North Korean soldiers marched past statues of founder Kim Il Sung and his son, former leader Kim Jong Il, on Monday in Pyongyang. North Korea celebrated Kim Il Sung's 101st birthday. Kyodo /Landov hide caption

itoggle caption Kyodo /Landov

Secretary of State John Kerry shakes hands with Chinese President Xi Jinping before their meeting at the Great Hall of the People in Beijing. Kerry sought China's help in easing tensions on the Korean peninsula. Paul J. Richards/AFP/Getty Images hide caption

itoggle caption Paul J. Richards/AFP/Getty Images

A South Korean soldier stands at a military checkpoint connecting South and North Korea at the Unification Bridge last week in Paju, South Korea. Chung Sung-Jun/Getty Images hide caption

itoggle caption Chung Sung-Jun/Getty Images

On Wednesday, a North Korean soldier looked on from the banks of the Yalu River on the border with China. Wang Zhao/AFP/Getty Images hide caption

itoggle caption Wang Zhao/AFP/Getty Images

Japan is on full alert ahead of an expected mid-range missile launch by North Korea, its defense minister said as the U.N. warned of a potentially 'uncontrollable' situation. A Japanese soldier walks past a missile launcher deployed in Tokyo. Toru Yamanaka/AFP/Getty Images hide caption

itoggle caption Toru Yamanaka/AFP/Getty Images

Carrying on as usual: Shoppers in central Seoul on Monday. Lee Jae-Won/Reuters /Landov hide caption

itoggle caption Lee Jae-Won/Reuters /Landov

Two women sit at a cafe Monday in central Seoul, South Korea. While North Korea has been issuing threats on a daily basis, many South Koreans say they're more bored than worried. Lee Jae-Won /Reuters /Landov hide caption

itoggle caption Lee Jae-Won /Reuters /Landov

Do not enter: Barriers, including spikes, at the Military Demarcation Line (MDL) near the Demilitarized Zone (DMZ) in the Gyeonggi province, South Korea. Jeon Heon-kyun /EPA /LANDOV hide caption

itoggle caption Jeon Heon-kyun /EPA /LANDOV

In this photo released in March by the North's Korean Central News Agency (KCNA), leader Kim Jong Un is said to be using a pair of binoculars to look south during an inspection of army troops stationed on two islands. /Xinhua /Landov hide caption

itoggle caption /Xinhua /Landov

On Thursday, a South Korean security guard kept watch as South Korean trucks waited to enter the Kaesong industrial complex in North Korea. For the second day, the North blocked the trucks and workers from the South from entering its territory. Kim Hong-ji /Reuters /Landov hide caption

itoggle caption Kim Hong-ji /Reuters /Landov

An undated file photo showing a general view of the North-South industrial complex in the North Korean city of Kaesong. Yonhap News/EPA /LANDOV hide caption

itoggle caption Yonhap News/EPA /LANDOV