Repeating the same mistakes has been U.S. foreign and military policy for decades, and now we’ve trained the Ukrainians. From Scott Ritter at sputnikglobe.com:

© Photo : Twitter / @clashreport
There are contradictory reports emerging from the Zaporozhye battlefield, with Ukrainian forces attempting to make a breakthrough near the village of Rabotino.
While the fog of war prevents a definitive account at this juncture of what is transpiring in and around Rabotino, one thing is for certain—this isn’t Ukraine’s first attempt to breach the Russian defenses there and, if they have indeed failed, this will not be there last.
The Battle for Rabotino may very well go down in the history of the Russian-Ukrainian conflict as a modern-day version of the Battle for Prokhorovka, fought on July 12, 1943, between the German and Soviet armies. In Prokhorovka, the Soviet defenses broke the back of the German armor attack. A similar situation appears to be unfolding today around the village of Rabotino, where Russian defenders are engaging Ukrainian attackers mounted on US- and German-made armor.
Ukraine and its NATO masters, in unleashing a renewed effort to break through Russian defenses in Zaporozhye, appear to be taking a lesson from the history of Scotland. Legend has it that Robert the Bruce, the first King of Scotland, after watching a spider fail in its attempt to build a web, only to try again, and again, until it was successful, used that experience as motivation for his persistence in his struggle against the English Crown.
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Kursk is legendary and still the largest tank battle in human history.
The Germans rushed poorly trained recruits and untested equipment (Panther/Elefant/Tiger) into layers of defense that had been built up for months.
The air forces overhead also had a Clash of the Titans with the tank buster Stuka G variant with two underwing 37mm autocannons and the CCCP with the “cement bomber” Ilyushin Il-2 Sturmovik.
There were no more large offensives for the Germans after Operation Zitadelle until the Battle of the Bulge and Operation Bagration started for the CCCP about one year later that annihilated Army Group Center.
There were many battles for Kharkov which switched occupations multiple times.