(Juan Barretto/AFP via Getty Images)
   Many images and videos have emerged in recent days of tanks, armored vehicles and other military equipment abandoned by Russian forces during their hasty retreat from the Kharkiv region.   

  While these losses are difficult to quantify, it is clear that the Russians lost or abandoned hundreds of pieces of equipment, including more modern hardware.  Analysts believe that, for example, a Russian tank division may have lost half its combat strength.   

  According to the General Staff of the Ukrainian army, during the week beginning September 6, 590 pieces of Russian equipment were destroyed.   

  “The enemy’s losses were 86 tanks and 158 armored fighting vehicles, 106 artillery systems, 159 vehicles and 46 units of other equipment,” the General Staff claimed.   

  CNN cannot independently verify the figures reported, but an independent group, Oryx — which has compiled Russian casualties since the start of the campaign — said it verified an increase in casualties among Russian units compared to August.  Most have occurred in Kharkiv, although the Russians have also lost equipment in Kherson and Donetsk.

A damaged Russian military vehicle is seen in Balaklia, Ukraine, on September 11. (Metin Aktas/Anadolu Agency via Getty Images) In just one day, on September 11, Oryx estimated that Ukrainian forces damaged, destroyed or captured 102 pieces of Russian equipment, including 23 tanks, 13 armored personnel carriers and 25 infantry fighting vehicles. The next day, the Russians lost another 99 pieces, according to Oryx figures.

  As it only counts observed and verifiable losses in its data, Oryx says the true loss rate is likely much higher.   

According to rolling averages compiled by Oryx, in the second week of September, Russian forces were losing an average of more than 60 pieces of equipment per day, compared with about 15 per day in the last week of August.  This is the highest sustained loss rate since several disastrous attempts to cross the Siverskyi Donets River in May. 

  During the same period, Ukraine’s verified losses were about 10 pieces of equipment.

Abandoned ammunition in a village on the outskirts of Izyum in Ukraine’s Kharkiv region on September 11. (Juan Barretto/AFP via Getty Images) Some of the equipment appears to have belonged to the Luhansk People’s Militia rather than Russian forces and is likely to be older. But also significant amounts of modern material were lost.

  Geolocated images show a number of updated T-80 tanks among those damaged or destroyed, as well as mine clearance vehicles and armored personnel carriers.   

  Military analyst Rob Lee of the Department of War Studies at King’s College London posted Monday that videos show T-80s, armored personnel carriers and other vehicles all crippled.  Lee later tweeted: “Russia’s 4th Tank Division has two tank regiments … With the latest losses at Izium, it has lost almost a full T-80U tank variant regiment in Ukraine, or half of the total that did not was stored.”   

  The Ukraine Weapons Tracker, which also analyzes social media and official images, said that at one location near Izium, “we counted at least nine T-80U and T-80BV tanks.”   

  Some more specialized equipment was also lost, including a Zoopark-1 radar station, which monitors the positions of enemy firepower.  Other videos show Ukrainian soldiers showing off captured Russian Tor and Osa short-range surface-to-air missile systems in the Kharkiv region.  There are also images of Russian Orlan-10 drones recovered by Ukrainian forces, apparently intact.   

  Some analysts believe that Russian forces left equipment behind due to a lack of fuel.   

  According to the Institute for the Study of War:   

“Russian troops likely withdrew from the area in great haste, and social media posts show abandoned tanks and other heavy military equipment near Izium, indicating that Russian troops failed to organize a coherent retreat.” 

  The loss of so many tanks and other equipment may also complicate the Russians’ task of regrouping units and forming a new defensive line inside the Luhansk region.

Members of Ukraine prepare to transport a captured Russian tank in the Kharkiv region on September 11. (Press Service of the Supreme Commander of the Armed Forces of Ukraine/Reuters)