Japan's Nikkei fell on Tuesday, as markets were jittery about a trade war as fresh U.S. tariffs came into effect, while a stronger yen added to investors' concerns. U.S. President Donald Trump's new 25% tariffs on imports from Mexico and Canada took effect,

The Nikkei stock index briefly dropped over 2 percent Tuesday morning on selling fueled by a stronger yen and concern over the impact

Japans Nikkei 225 fell 1.8% to 37,096.51 by midday Tuesday, its lowest level since September 18, as investors grew cautious ahead of new U.S. tariffs on Canada, Mexico, and China. The Topix index dropped 1.