The geolocation on Google maps:
The strategic importance of this is that the Siversky Donets river a natural barrier is. Blowing up the bridges limits the possibilities of the Ukrainian army to attack the supply lines between Slovyansk and Lugansk.
It also is an indication that the rebels are having a hard time and are in no means to gain ground to the North.
Also see the battle for the bridge of Rubizhne.
Also see Are the rebels preparing a retreat?