Royal Dutch Shell gave final push

Lengthy talks, late breakthrough highlight Idemitsu, Showa Shell deal

Showa Shell CEO Tsuyoshi Kameoka, left, almost did not attend Thursday's news conference.

TOKYO -- The integration agreement between Idemitsu Kosan and Showa Shell Sekiyu came only after a yearlong process fraught with difficulty and a frank last-minute discussion between the two Japanese oil companies' leaders. Idemitsu CEO Takashi Tsukioka praised his Showa Shell counterpart, Tsuyo...