US President Barack Obama (R) speaks with OECD Secretary-General Angel Gurria (L) as they take part in a dialogue with world leaders at the G7 Summit in Shima in Mie prefecture on May 27, 2016. A British secession from the European Union in next month's referendum could have disastrous economic consequences, G7 leaders warned on May 27 at the close of the summit in Japan. / AFP / STEPHANE