(Updates headline, lead and paragraph 3, 5-7, 9-11) * Trump optimistic of deal with China * US Treasury Sec Bessent says had "very substantial negotiations" * World's two largest economies seek to avert trade war escalation * Bessent said discussed trade, rare earths, fentanyl, TikTok * Extension of trade truce possible By Xinghui Kok KUALA LUMPUR, Oct 26 (Reuters) – U.S. President Donald Trump said he was confident of hashing out a deal with President Xi Jinping, whom he is expected to meet next week, after top economic officials from both countries concluded two days of discussions on Sunday to de-escalate a trade war. U.S. Treasury Secretary Scott Bessent and Trade Representative Jamieson Greer met with Chinese Vice Premier He Lifeng and top trade negotiator Li Chenggang on the sideline

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