"Every day, dozens of ordinary innocent people (in Ukraine) are killed by shelling from Belgorod.... We forced to strike at military positions located in the cities of Belgorod and Kursk," they said in the joint statement.
The Freedom of Russia Legion, a Russian volunteer group supporting Ukrainian forces, claims responsibility for an attack near the village of Terebreno.
The Russian Volunteer Corps and the Freedom of Russia Legion are "preparing for extensive actions" to "to strike the most critical targets on the territory of Russia," Ukrainian Deputy Intel chief Skibitskyi told Ukrainska Pravda