2022 Russian Invasion of Ukraine - Ruzzians: "Nooo, you can't just walk in, crush our defence and take your territories back!" Ukrainians:

This was the most impressive counter attack of the war so far. MONTHS of Russian advances destroyed in a few days.

I believe it happened due to the Kherson counter offensive. The Russians deployed most of their troops in Kherson and got caught with their pants down in Kharkiv

I suppose Soviet Treasure Island was made Kyiv.