By Jeff Mason, Bart H. Meijer and David Brunnstrom WASHINGTON/BRUSSELS (Reuters) -U.S. President Donald Trump opened a new phase on Monday in the trade war he launched this year, telling partners, from powerhouse suppliers such as Japan and South Korea to minor players,

President Trump said Japan and South Korea would face tariffs of 25 percent unless they reached an agreement with the United States. Other countries received notice of higher levies.

The US plans to impose a 25% tax on products entering the country from South Korea and Japan on 1 August, President Donald Trump has said.He announced the tariffs in a post on social media, sharing letters he said had been sent to leaders of the two countries.