The U.S. (L) and Japanese national flags are hoisted next to a traditional Okinawan Shisa statue at the U.S. Marine's Camp Foster in Ginowan, on the southern island of Okinawa, Japan June 18, 2016. REUTERS/Tim Kelly TOKYO, Aug 13 (Reuters) - Japan and the U.S. will agree this week to jointly develop an interceptor missile to counter hypersonic warheads being developed by China, Russia and North Korea, Japan's Yomiuri newspaper said on Sunday. The agreement on interceptors to target weapons designed to evade existing ballistic missile defences is expected when President Joe Biden meets Japanese Prime Minister Fumio Kishida in...