- Ukraine tried attacking with big columns of armored vehicles — but it was a disaster so it stopped.
- Russia, meanwhile, repeatedly deployed the same bad strategy, an expert told Business Insider.
- The battle in Avdiivka showed Russia taking months to adapt, he said — far longer than Ukraine.
Russia failed to realize a crucial element of its tank strategy was failing, an expert told Business Insider.
The error caused it huge losses — and is all the more striking because Ukraine had already made the same mistake, only to quick fix it.
The tactic in question was deploying tanks in large groups — an armored column — in the hope of smashing through enemy lines.