Here is today's situation map of eastern Ukraine by the National Security and Defense Council:
By RFE/RL
Amnesty International (AI) has expressed concern over an incident in which pro-Russian separatists paraded captive Ukrainian troops through the rebel-held city of Donetsk.
Rebel fighters accompanied by a separatist leader, Aleksandr Zakharchenko, on January 22 marched about a dozen captives to the site of a blast that hit a trolleybus and reportedly killed 13 people earlier in the day.
The prisoners were forced to kneel and subjected to verbal and physical abuse, apparently by angry residents.
Video footage showed at least one being beaten.
Amnesty International said the reports and footage were "worrying."
"Mistreatment of prisoners constitutes a violation of international humanitarian law," the London-based human rights group said in a statement on January 22.
The incident followed increased fighting that has further clouded the prospects for an end to a conflict that has killed more than 4,800 people since April.