According to the [North] state-run Korean Central News Agency, Kim sent the letter to Xi the previous day, expressing his belief that cooperation between the two countries "will become even closer in the future."
He was also quoted as saying that strengthening the "traditional friendship" between North Korea and China would help meet the "new demands of the times."
The letter was a reply to Xi, who sent a congratulatory message late last month when Kim Jong-un was re-elected general secretary of the ruling Workers' Party at the country's rare party gathering.
Kim also thanked Xi for his message, saying it provided "support and encouragement" for himself and party members.
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