(Bloomberg) --Berkshire Hathaway Inc. will invest 287.4 billion yen ($1.8 billion) in insurer Tokio Marine Holdings Inc., ramping up the US conglomerate's exposure to the Japanese market.Processing ContentNational Indemnity Company, a subsidiary of Berkshire, will make a 2.49% strategic investment in Tokio Marine, according to a statement Monday. The two companies will collaborate on reinsurance and global investments including mergers and acquisitions. The move underscores Berkshire's growing ambitions in ...