By Jeff Mason and Leika Kihara WASHINGTON/TOKYO (Reuters) -Powerhouse Asian economies Japan and South Korea said on Tuesday they would try to negotiate with the U.S. to soften the impact of sharply higher tariffs that President Donald Trump now plans to impose from the start of August.

New vehicles from the Japanese auto makers Subaru and Honda are seen at a parking lot in the Port of Richmond, as trade tensions escalate after U.S. President Donald Trump said he would impose a 25% tariff on goods from Japan and South Korea starting on August 1,

The U.S.’s closest security allies in Asia, along with six Southeast Asian countries, have been given another three weeks to negotiate trade deals — or face higher tariffs.

The European Union expects to find out on Monday whether President Trump will impose more tariffs, in a move economists have warned would have repercussions on both sides of the Atlantic.

President Donald Trump has threatened steep tariffs on America’s trading partners, sending letters to more than a dozen world leaders, warning they have less than a month to strike a deal.

WASHINGTON—President Trump reignited his global trade war Monday, renewing his threat to hit partners with punishing tariffs even as he announced a three-week extension to negotiate deals. Trump signed an executive order extending the date when his so-called reciprocal tariffs would take effect,