Ukraine’s military intelligence chief denied recent media reports that North Korean troops deployed to Russia have temporarily retreated from the front lines, in an interview published on Wednesday.

North Korean soldiers previously fighting alongside Russia's army on the Kursk front line appear not to have been engaged in combat since mid-January, South Korea's spy agency told AFP on Tuesday, after Ukraine claimed they had been withdrawn following heavy losses.

January, there have been no signs showing North Korean troops deployed to the Russian Kursk region engaging in battle," South Korea's National Intelligence Service (NIS) said, suggesting that heavy losses may have been one of the reasons for their withdrawal.

North Korean soldiers fighting alongside Russia's army in the Kursk region appear to have suspended combat operations last month, South Korea's spy agency told AFP Tuesday, coming after Ukraine claimed the soldiers had been pulled from the front line after facing heavy losses.