That’s the assertion of Reporting from Ukraine, who says that the counterattack is happening in Zaporizhzhia:
Reporting from Ukraine is pretty rah-rah for Ukraine, always putting a positive spin on things (“Ukrainian troops successfully withdrew from northern Bakhmut”), but he’s good on reporting the nitty gritty details of tactical movement and seems to have direct sources in the Ukrainian military.
Takeaways:
Institute for the Study of War also has a similar confirmation-that’s-not-quite-a-confirmation: “Ukrainian Deputy Defense Minister Hanna Malyar reported on April 19 that Ukrainian forces are already conducting some counteroffensive actions. Malyar stated that Ukrainian forces will never preemptively announce when the counteroffensive starts and reiterated that Ukrainian forces aim to liberate all Ukrainian territory.”
Deep State shows some small recent-ish Ukrainian gains there:

Plus there’s this:
The #Ukrainian #Army has begun marking its #tanks, Bradley IFVs and other #NATO-supplied armoured vehicles with an (-arrow going forward-), something indicating about the coming #counteroffensive in different directions.#Russia #Ukraine #News #NAFO
Src: https://t.co/Hv96o8KTxX pic.twitter.com/WDd5bMK5Ud— Geoff' The Frenchy Fella – War News 🇺🇦 (@Geoff_WarNews) April 20, 2023
So it’s hard to say for sure that this push is the much-anticipated Big Spring Counteroffensive. It could be a probing raid, or it could be a faint, with the main blow scheduled to fall elsewhere. Certainly Zaporizhzhia is the front section that has the most promise to split Russian forces in half and cut Russian forces in Kherson and Crimea off from resupply. Russia has to know this, and has been extending defense trenches throughout the area, but continues to throw troops into the Bakhmut meat-grinder rather than (as far as observers can tell) seriously reinforcing the area. Maybe Russia has reinforced it more than we know, but maybe not. It would be very far from the first time Russia made a stupid, obvious mistake in this war.
Maybe it’s more accurate to say that a counteroffensive is underway.
