Japan's key stock indexes plunged over 2 percent Monday on selling fueled by fears over the adverse effect on companies after U.S. President Donald Trump ordered tariffs on China, Canada and Mexico.Automakers were especially hard hit as they have production bases in countries neighboring the United States, with concerns over the escalation of tariff measures also dampening market sentiment, brokers said.The 225-issue Nikkei Stock Average ended down 1,052.40 points, or 2.66 percent, from Friday at 38,520.09. The broader Topix index finished 68.27 points, or 2.45 percent, lower at 2,720.39.On…READ FULL ARTICLE