India, Aug. 19 -- South Korea's president said on Tuesday a solid alliance with the US strengthens the foundation of national security, as many South Koreans were baffled and concerned about US President Donald Trump's abrupt order to "substantially reduce" joint military exercises. Trump made the surprise announcement in a social media post just before US and South Korean soldiers began Monday's annual Ulchi Freedom Shield exercises, which are largely designed to sharpen readiness against North Korean threats. Trump cited what he said was good relationship with North Korean leader Kim Jong Un and South Korea's refusal to join the US war against Iran. Trump's move was apparently taken without consultations with South Korea and meant to re...