The Shoulder Sleeve Insignia of the Zarya Battalion; a unit of the Army of the South-East.Text states at the top "Army of the South-East" (АРМИЯ ЮГО-ВОСТОКА)
Underneath the red star it states "Lugansk People's Liberation Battalion" (ЛУГАНСКИЙ НАРОДНО-ОСВОБОДИТЕЛЬНЫЙ БАТАЛЬОН)
The large writing in the bottom is the name of the Battalion - Zarya/Dawn ("ЗАРЯ")
Own work. Based on SSI seen here.