"Respected general secretary [of the Communist Party of China] was the first to send sincere and warm congratulations to me on my re-election as chairman of the State Affairs Commission of the Democratic People's Republic of Korea … I am sincerely grateful for this and express heartfelt thanks to you," Kim wrote in a letter to Xi, as quoted by the North Korean state-run KCNA news agency.
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In a separate message to the Vietnamese president, Kim thanked him for "powerful support and encouragement to the struggle of our Party, state and people for building a powerful socialist country."
The re-election took place last week at a session of the North Korean parliament.