April 18 (UPI) -- George Glass, the new U.S. Ambassador to Japan said he is "extremely optimistic" Tokyo and Washington can reach a deal over tariffs between the two countries, while presenting a unified front against China and Russia. Glass officially took office in Tokyo earlier this week where he acknowledged Japan is located "in a very tough neighborhood" geographically, while stressing bilateral cooperation between it and the United States. The Oregon businessman was appointed earlier this