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.

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."