Rakuten chief executive Hiroshi Mikitani, left, and Japan Post chief executive Hiroya Masuda pose together during a press conference in Tokyo on Friday. AP
Rakuten chief executive Hiroshi Mikitani, left, and Japan Post chief executive Hiroya Masuda pose together during a press conference in Tokyo on Friday. AP

Rakuten to raise $2.2bn as Japan Post, Tencent and Walmart buy stakes