By Hyonhee Shin SEOUL (Reuters) -North Korean leader Kim Jong Un has thanked South Korea’s outgoing president for trying to improve relations, a rare gesture of goodwill but one that analysts said may not be enough to head off growing tension between the two Koreas. The warm words from North Korea to President Moon Jae-in came in an exchange of letters less than three weeks before Moon leaves office to be replaced by a conservative leader who has already signalled a tougher line on North Korea Analysts were sceptical that North Korea’s message heralded a broader improvement in relations, and w…

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