TOKYO (Reuters) -Japan's leading trade negotiator said on Tuesday that the trade deal Tokyo agreed with the United States last week guarantees Japan will always receive the lowest tariff rate on chips and pharmaceuticals of all the pacts negotiated by Washington.

President Donald Trump’s flurry of trade deal announcements are so far proving light on detail — with key aspects still under negotiation, partners giving mixed signals about what they signed up for,

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

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.

That's down from the 25% levies he proposed earlier this month. Japan's prime minister says duties on autos from his nation will be cut to 15% from 25%.

Trump said the U.S. will impose a 15% tariff on Japanese imports under the agreement, which he hailed as "maybe the largest deal in history."

President Donald Trump announced a long-awaited trade agreement with Japan on Tuesday night, a framework between allies and major trading partners that appeared elusive just weeks ago.

Japan will invest $550 billion in the U.S. and allow the U.S. to tax Japanese goods sold in America at 15 percent.

Recent pacts with Britain, Europe and Japan mean that autos exported from those countries and regions face lower U.S. tariffs than Canadian vehicles do.

"We're in much better shape because it's now clear that if there's gonna be a real trade war with anyone, it would just be with China," Secretary Ross tells Fortune.