President Donald Trump announced a trade agreement with Japan on Tuesday, making it the largest U.S. trade partner to broker an accord as the White House threatens to impose tariffs on dozens of countries within days.

The new U.S.-Japan trade deal lowers tariffs and strengthens economic ties, helping challenge China's regional aggression and instability.

Japan said on Tuesday the trade agreement it struck with the U.S. cleared uncertainties on U.S. trade policies but continued attention needs to be given to risks of those policies putting downward pressure on the Japanese economy.