Ukraine’s President Petro Poroshenko says that he had a “permanent ceasefire” agreement with Russian President Vladimir Putin by phone. However, the Kremlin said that Mr Putin had not agreed to a ceasefire ‘as Russia was not party to the conflict’.
The earlier version of the statement on the Ukrainian presidential website read: "Their conversation resulted in agreement on a permanent ceasefire in the Donbass region [the regions of Donetsk and Luhansk]."
However, this has now been changed to: "Their conversation resulted in agreement on a process for ceasing fire in the Donbass region."
The statement adds that the two presidents "reached a mutual understanding on steps leading to peace".
However, the rebels in Ukraine’s eastern regions of Donetsk and Luhansk have said that there will not be a ceasefire until the government withdraws its forces.
Meanwhile, US President Barack Obama has expressed solidarity with Baltic member-states of Nato on a visit to Estonia.
A Nato summit opening in Wales on Thursday is expected to back plans for a rapid response force.