Tensions escalate as defiant North Korea 'makes unsuccessful missile launch' day after massive show of strength

Cristina Varriale, an expert in nuclear proliferation at the Royal United Services Institute, said: “The development of an ICBM would be particularly concerning for South Korea and Japan, because once the US know they can be targeted at home that may change their calculus as to whether they are prepared to help defend those countries if they are attacked by North Korea.”