US President Joe Biden, Japan's Prime Minister Fumio Kishida, and South Korea's President Yoon Suk Yeol pose for photos ahead of their trilateral meeting during the G7 Leaders' Summit in Hiroshima on May 21, 2023. (Photo by Brendan SMIALOWSKI / AFP) (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images) Brendan Smialowski | Afp | Getty Images A U.S. summit with Japan and South Korea will lay out "ambitious" steps to bolster trilateral security ties in the Indo-Pacific region, a senior Biden administration official said, adding its also aimed at deterring China's growing aggression. President Joe Biden will unveil the measures with…