(Adds comments) SINGAPORE, Oct 30 (Reuters) – U.S. President Donald Trump and China's Xi Jinping concluded talks on Thursday at a South Korean air base with both leaders sounding optimistic about cooling trade tension between the world's two largest economies. Trump said he struck a deal to reduce tariffs on China in exchange for Beijing resuming U.S. soybean purchases, keeping rare earths exports flowing and cracking down on illicit trade of fentanyl. Here are comments from investors and market analysts: CHARU CHANANA, CHIEF INVESTMENT STRATEGIST, SAXO, SINGAPORE "This looks like an early attempt to reset the U.S.–China narrative by reopening selective trade channels to restore confidence. "Plenty of gaps still left, though no timeline on rare earths. Soybeans not a huge win if China’s cr

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