The month-old invasion of Russia's Kursk region has produced some positive effects for Ukraine, but one key goal hasn't been achieved yet.

Russian forces seem to have summarily executed a group of surrendering Ukrainian soldiers near Pokrovsk in late August, CNN reported on Sept. 6, publishing an exclusive video.

Ukrainian prosecutors said on Friday they had launched an investigation into the alleged Russian shooting of three surrendering Ukrainian servicemen on the eastern front near Pokrovsk, the main focus of Russia's assault.