The Japanese yen weakened to its lowest level against the U.S. dollar since 1986 on Tuesday, keeping investors on alert for possible intervention from Japanese authorities. The yen fell to 162.19 per dollar as of 1.27 a.m. ET, marking its lowest level in four decades, according to data from LSEG. Japan's Finance Minister Satsuki Katayama said Tuesday the government was ready to take appropriate ac...