Japan has reported its exports fell in May as shipments of autos to the U.S. dropped nearly 25% from a year earlier due to higher tariffs imposed by President Donald Trump.

Prime Minister Shigeru Ishiba, speaking after the G7 summit in Canada, confirmed that negotiations with Washington had failed to yield a full tariff agreement.

TOKYO—Japan’s exports fell for the first time in eight months in May, bolstering views that the impact of President Trump’s tariffs could tie the Bank of Japan’s hands on rate hikes. Exports, a main engine of growth for Japan’s economy,