Sapporo Holdings is one of Japan's biggest alcohol and soft drinks producers and the country's oldest brewer. This month, Andy Morton met with its president, Tsutomu Kamijo, to discuss why he'd like to get his hands on Anheuser-Busch InBev's Pilsner Urquell, the state of play in Vietnam and why even BrewDog's founder gets excited about Sapporo's beer.