london prime minister theresa may outrage north korea fire missile fly northern japan friday britain keep press china increase pressure state spokesman say north korea fire missile fly japan northern hokkaido far pacific ocean south korean japanese officials say deepen tension pyongyang recent test powerful nuclear bomb prime minister outrage north korea continue reckless provocation strongly condemn regime illegal test spokesman say key focus continue press china keep pressure north korea change course british pm may outrage north korea 's 'reckless provocation spokesman