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,

The 14 countries sent letters so far, which included smaller US exporters like Serbia, Thailand and Tunisia, hinted at opportunities for additional negotiations while at the same time warning that any reprisal steps would be met with a like-for-like response.

Identify the top geopolitical priorities facing South Korea’s newly elected President Lee Jae-myung.