By David Brunnstrom, Josh Smith and Ju-min Park WASHINGTON/SEOUL (Reuters) -South Korea's new president, Lee Jae Myung, will face a pivotal moment on Monday when he meets U.S. President Donald Trump in Washington for their first summit,

At a summit meeting in Washington, D.C. on Monday, the U.S. and South Korean presidents will discuss modernizing their 71-year-old alliance and fleshing out a trade deal reached last month.

Washington’s increasing focus on Beijing is straining the decades-old alliance between South Korea and the United States.