But Ukraine appeared unwilling to budge.
A source close to the Kiev delegation said the rebels pressed demands on Wednesday that went far outside the scope of the original Minsk deal.
"If we continue these consultations, it should only be in order to sign the Minsk (deal) and to develop them further -- and not to revise them, which is what the Donetsk and Lugansk representatives tried to do," the source told the Interfax-Ukraine news agency.