Seoul: North Korean leader Kim Jong-un has told Russian President Vladimir Putin that their alliance "will be invariably carried forward in the future," as Pyongyang and Moscow have deepened military cooperation over Russia's war against Ukraine.

Kim made the remarks in a letter sent to Putin that congratulated the Russian leader on his birthday, according to a report by the North's Korean Central News Agency (KCNA).

"I do not doubt that the relations of alliance between the two countries, which have greeted the great heyday, will be invariably carried forward in the future, too, thanks to the warm friendly relations and close comradely ties between us, and will make a great contribution to powerfully propelling the comprehensive development of bilateral relations and establishing a jus

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