An average of 13 people have been killed daily in eastern Ukraine since a 5 September ceasefire came into place, the UN human rights office says.
In the eight weeks since the truce came into force, the UN says 957 people have been killed, amid continuing violations on both sides.
A new report by the office describes a total breakdown of law and order in rebel-held Donetsk and Luhansk.
It also highlights credible allegations of abuses by government forces.
Russia has been widely accused of fanning the violence by covertly supplying the rebels with military aid — an accusation it denies.
Ukrainian Prime Minister Arseny Yatseniuk accused Russia on Thursday of seeking “deliberately to provoke a large-scale war”. The actions of Russian President Vladimir Putin, he told a news conference, were a “threat to everyone, the global order, global peace”.
