RT.com reports:

"The Russian Defense Ministry has confirmed withdrawal of troops from multiple locations across Ukraine's Kharkov region. The development comes amid a Ukrainian offensive in the area."

"The Russian military and allied forces of the People's Republics of Donetsk and Lugansk were ordered to leave the city of Izyum on Saturday."

"Reports have emerged of Ukrainian troops entering Kupyansk, which has served as a logistical hub for the Russian forces, and fighting breaking out on the outskirts of Krasny Liman."

southfront.org reports:

"Russian Forces Retreat"

Is Putin's Goody Two Shoes Behavior with his "Limited Operation" Blowing up in his face?

Paul Craig Roberts

The Kremlin's attempt to fight a war with minimal resources and no commitment to disrupt the government and functioning of Western Ukraine and the weapons flowing in from the US and NATO now brings the humiliation of having Ukrainian troops break through Russia's thinly defended line in the Kharkov region of Eastern Ukraine.