UPDATE 1-Japan Post to acquire 7-8 pct stake in U.S. insurer Aflac for $2.6 bln -Nikkei

Japan Post Holdings is set to acquire a 7-8 percent stake in U.S. insurer Aflac for about 300 billion yen ($2.6 billion), the Nikkei Shimbun daily said on Thursday, in a bid to expand overseas as the domestic market shrinks.