(Updates prices at 0354 GMT, details throughout, analyst comment in paragraph 5-6) By Ella Cao and Lewis Jackson BEIJING, Oct 28 (Reuters) – Chicago soybean futures touched a more than 15-month high on Tuesday, driven by optimism that the U.S. could reach a trade deal with China as leaders from both the countries are expected to meet in South Korea on Thursday. As of 0349 GMT, the most-active soybean contract on the Chicago Board of Trade (CBOT) gained 0.55% to $10.91 per bushel, the highest since July 2024. Trump said on Monday the U.S. and China were set to "come away with" a trade deal, while Treasury Secretary Scott Bessent told NBC on Sunday that China would make "substantial" soybean purchases under a proposed framework. China has not yet officially confirmed the leaders' meeting. "T

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