TOKYO : Japanese economy minister Ryosei Akazawa said on Wednesday he believed a potential foreign acquisition of retail giant Seven & i was a matter "heavily related" to national security. The owner of 7-Eleven convenience stores has rejected a $47 billion buyout offer from Canada's Alimentation Couche-Tard and the retailer's founding family is in talks to take the company private to fend off the takeover. "Speaking about a potential acquisition of Seven & i, I think the matter is heavily