It appears that Ukraine has retaken parts of Kharkiv province: Zelenskiy Confirms Ukrainian Forces Regain Control Over Kharkiv Border Amid Russian Offensive (msn.com). The Ukrainian president, Volodymyr Zelelskyy, announced on Friday (24 May) that Ukraine had retaken control over the border areas. Russia is still claiming to control half of Vovchansk, which is 3 miles (5 km) inside the Ukrainian border.
Map of Vovchansk area (courtesy of @War_Mapper).
My conclusion is that this Kharkiv attack was a diversion. Not sure I believe the claims of high Russian losses.
There is still fighting around Kupiansk and in the Pokrovsk sector (in the center of front in the Donbas region, to the west of Bakhmut, Donetsk and Avdiivka). See: General Staff: Most Combat Engagements Recorded In Pokrovsk Sector (menafn.com) and Ukrainian defenders hit 16 clusters of Russian military personnel – General Staff (msn.com). There is fighting around Ocehretyne, which is less than 10 miles (16 kilometers) NW of Avdiivka (which is just NW of Donetsk).
(courtesy of @War_Mapper).
I am beginning to think I might actually be right about this: There may not be a major Russian spring/summer offensive – The Dupuy Institute
There is a Rusi article on the subject that I am not sure of: In Ukraine, Russia is Beginning to Compound Advantages | Royal United Services Institute (rusi.org)
First, where does the figure of 510,000 troops come from?
Then the is the issue of the length of the front. They are saying 1,200 kilometers. That is really not a properly representative figure. If Kharkiv province is back of list of contested areas west of Kupyansk, then we are really looking at a front from Kupyansk to Kakhovka Reservoir of maybe 400-500 kilometers (250 – 300 miles). This is the action front. Vovchansk is around 80 kilometers from Kupyansk. See: The front is really not 1,200 kilometers long – The Dupuy Institute
In the end nibbling is not the same as a major offensive.