It is the most significant of a clutch of agreements Trump has bagged since unveiling sweeping global levies in April, though like other deals, exact details remained unclear.

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."

Donald Trump unveils trade agreements with the European Union and Japan that will set baseline tariffs at 15%, with promises that they'll also invest billions of dollars in the U.S., details unspecified.