By John Geddie, Yukiko Toyoda, Ben Blanchard and Aftab AhmedTOKYO/TAIPEI/NEW DELHI, Aug 24 (Reuters) - Donald Trump's olive branch to North Korea's Kim Jong Un at the expense of a long-standingally comes at a pivotal moment for U.S. security ties in Asia, as partners from Japan to India reassess how much they can rely on Washington.

While alarming for Seoul, an abandonment of US guarantees could be disastrous for Tokyo, says Leo Lewis for The Financial Times.

Trumps outreach to North Korea is unsettling US allies across Asia, with Japan, Taiwan and India reassessing Washingtons security commitments. His decision to cut military…