Ukrainian President Volodymyr Zelenskyy has released another video showing a captured North Korean soldier undergoing interrogation, accusing Russia of using North Korean troops to "prolong and escalate" its war against Ukraine.

SEOUL, Jan. 11 (Yonhap) -- Ukrainian President Volodymyr Zelenskyy said Saturday that Ukraine has captured two wounded North Korean soldiers in Russia's western Kursk region and investigators are questioning them.

The soldiers, reportedly from North Korea's elite Storm Corps, have apparently been ordered to kill themselves rather than be taken prisoner.

The soldier claimed he was alone on the battlefield for three-to-five days before Ukrainian forces found him and gave him "an injection of some kind".

Ukrainian President Volodymyr Zelensky on Tuesday released a video showing additional questioning of a North Korean soldier recently captured by Ukrainian forces.