Lol. They are not trying to break out, and there is no "encirclement".
Ukrainians on the north side of the Donetsk are conducting harassing attacks on the Russian LOC, but there are no strategic positions on that side of the river for Ukraine. Eventually they will retreat to the south bank, and will blow the remaining bridge and the Oskil dam. The Russian advance (if there ever is one) will be mired in the mud again.
The speed of the Russian advance has been 0.78 km/day- you are not going to surprise anyone at that pace.
The terrain around Izium is open fields interspersed with forests- perfect for the defenders, and bad for Russia who has to advance on 2 main roads.
And oh by the way, the command HQ's in Izium and Kherson were just destroyed by Ukraine, so there is ZERO C2 on the Russian side right now.
The line of contact will remain static for the foreseeable future. Russia will continue to make the daily attacks and Ukraine will continue to repel, and the conscripts Russia is throwing at the Ukrainian positions will keep getting killed in large numbers.