Anxiety over U.S. tariffs has been spreading across Japan, a central bank report shows, sending a worrying signal about the corporate outlook as trade uncertainty deepens.

While South Korean imports to the U.S. face 25% tariffs, the same as Trump promised in April, the rate on Japan has been raised by 1 percentage point to 25%.

Secretary of State Marco Rubio met counterparts in Southeast Asia during his first visit to the region since taking office.

President Donald Trump on Monday set a 25% tax on goods imported from Japan and South Korea, as well as new tariff rates on a dozen other countries.

In letters so far to 14 countries, including smaller exporters to the United States such as Serbia, Thailand and Tunisia, Trump hinted at opportunities for additional negotiations, even while warning that reprisals would draw a like-for-like response.

President Donald Trump sent out letters to nations that haven't entered into trade agreements with the U.S., informing them of their new tariff rates.

The US sets reciprocal tariffs of 25% for Japan and South Korea. Both countries vowed to accelerate negotiations within three weeks.

Japanese Prime Minister Shigeru Ishiba on Tuesday said US-imposed tariffs on Japanese imports would have an impact on the country, but added that negotiations would continue.

Export price index for vehicles shipped to North America plunged 19.4 per cent from a year earlier in June. Read more at straitstimes.com. Read more at straitstimes.com.