Amid tension between the US and North Korea, it's difficult for South Korea and Japan to think about how to behave in this hazardous situation. Though it's not a serious problem for US owing to its distance between North Korea and US, neighboring countries cannot do mischievous things. If they stimulate North Korea in a wrong way, they will soon be endangered to be attacked by missiles.
http://edition.cnn.com/2017/04/12/politics/trump-xi-phone-call/index.html
