For anyone interested, this is a reasonably accurate map using geolocated video and photos to determine demarcation and zones of contact between the two sides: Russian controlled territory in red, conflict zones the fighting mostly occurs within in yellow, blue/green is Ukie held. Red arrows denote current attempts at offensive actions.
The easiest evac route is the road from Sudza to Yunakivka and the Russians are probably close enough to portions of it for them to disrupt Ukie movements with FPV drones and artillery but there is no risk of encirclement and if anything, the Ukie's have closed already pulled back forces and are now defending contact lines about half the total length of what they were defending previously in Kursk. The rumour is that the Russians are using 60-70K troops here (which has led to gains in Toretsk and Prokrovsk, the zones the Russians pulled forces from to send to Kursk) vs 15-18K ukies.
What probably happens is a fairly orderly retreat from Russian territory over the next few weeks. The intent was to punch Putin in the mouth and force him to redistribute forces from the Donetsk frontlines to defend a poorly defended region, not to permanently annex Russian territory at whatever cost.