Ukrainian President Volodymyr Zelenskyy said on Monday that “Mariupol has been destroyed, tens of thousands of people [are] dead, but the Russians are still conducting military operations. ” Zelensky made the remarks addressing South Korean lawmakers. “Ukraine needs a variety of military technologies from airplanes to tanks,” he was quoted as saying by Reuters. “South Korea can help us.” A woman on Friday pulls her bags from houses that were damaged during fighting in Mariupol. (AP / Alexei Alexandrov) RUSSIA INVASES UKRAINE: LIVE UPDATES Mariupol officials estimated that about 5,000 civilians had been killed, but warned last week that, given the scale of the devastation in the city, the death toll could be in the tens of thousands. The Mariupol City Council last week also accused Russian forces of relying on a mobile crematorium to cover up their alleged war crimes there. Ukrainian President Volodymyr Zelenskyy addresses members of South Korea’s parliament via video link to the National Assembly on Monday. (Chung Sung-Jun / Pool Photo via AP) CLICK HERE TO RECEIVE THE FOX NEWS APPLICATION Mariupol, which has been partially occupied for weeks, has been the target of one of the most brutal Russian attacks in Ukraine since the invasion began on February 24. On Monday, the UK Department of Defense said that “Russian forces previously used phosphorus munitions in the Donetsk region are increasing their chances of future employment in Mariupol as fighting for the city intensifies.” Fox News’ Caitlin McFall and James Levinson contributed to this report.