Separatist militants are thinning on the streets of Donetsk . ` Shelling has already pushed some residents to take shelter underground . The separatists have been trying for weeks to break through a cordon around their stronghold in Donetsk, but they were unable to do so until Tuesday when Ukrainian forces launched an offensive against them. A fast military advance leaves shattered windows and damaged homes behind .
Separatist militants are thinning on the streets of Donetsk . Shelling has already pushed some residents to take shelter underground . The separatists have been trying for weeks to break through a cordon around their stronghold in Donetsk, but they were unable to do so until Tuesday when Ukrainian forces launched an offensive against them. A fast military advance leaves shattered windows and damaged homes behind .