Kyiv, UkraineCNN — The scenes are chaotic: Russian tanks veering wildly before exploding or driving straight into minefields, men running in every direction, some on fire, the bodies of soldiers caught in tank tracks.Russian military bloggers are calling it a fiasco, and worse.These scenes have been recorded by Ukrainian military drones over the past two weeks around the town of Vuhledar in Donetsk, eastern Ukraine, where successive Russian assaults have failed.The Vuhledar debacle suggests chronic failures in the command and tactics of the Russians as they gear up for a spring offensive. If replicated elsewhere on the long military front in Donetsk and Luhansk, such failings could jeopardize the Kremlin’s plans to seize more territory.About 20 videos geolocated by CNN show basic tactical blunders in an area that’s open and flat, where Ukrainian spotters on higher ground can direct artillery strikes and where minefields are worsening Russian casualties.Kim Jong Un's daughter on display at lavish event. Here's what it could mean02:33Here's why the earthquake in Turkey and Syria was so deadly02:34Newborn still tied to mother with umbilical cord pulled from rubble02:51See image of a Chinese balloon hovering over Taiwan03:05Dramatic video appears to show heavy losses among Russian armored formations01:34Two of her children died in a terror attack. Hear her message01:47Analyst thinks this is why more unidentified objects are being spotted01:57'Oh Aunty, how I love you': Hear man's response when elderly aunt is found after 152 hours under rubbleNOW PLAYINGSome searchers are transitioning to mourners as time passes following earthquake02:29North Korea's parade shows off missiles and Kim Jong Un's potential successor. See what it looked like01:30Indigenous communities battle illegal gold miners in the Amazon (2021)04:53This could be the next battlefield in modern warfare02:22Why retired maj. general believes Russia is getting 'routinely smashed' by Ukraine02:01Rescuers celebrate after saving boy from rubble02:16What the US knows about China's spy balloon thus far02:47Drone footage shows massive destruction after earthquake00:50Kim Jong Un's daughter on display at lavish event. Here's what it could mean02:33Here's why the earthquake in Turkey and Syria was so deadly02:34Newborn still tied to mother with umbilical cord pulled from rubble02:51See imagage.