Ukrainian President Petro Poroshenko and leaders of Russia, France and Germany expect their talks in Minsk, Belarus, on Wednesday to lead to a "swift and unconditional ceasefire", his website said.
A statement from Poroshenko's administration said progress had been made during a phone call between him and Russia's Vladimir Putin, German Chancellor Angela Merkel and French President Francois Hollande on Sunday.
"The participants achieved progress in discussing a range of measures for implementation of the Minsk agreements," Poroshenko said referring to a ceasefire plan which took effect last September but was never fully observed and eventually collapsed.
Confirming that the four leaders would meet in Minsk on Wednesday, Poroshenko said: "They (the leaders) also expect that their efforts during the Minsk meeting will lead to a swift and unconditional two-sided ceasefire."
Russian Foreign Minister Sergei Lavrov said on Sunday he expected "important decisions" to be made at the Minsk talks.