Russia has denied claims from the Ukrainian government that the two countries have agreed on a permanent ceasefire for eastern Ukraine.
"(Vladimir) Putin and (Petro) Poroshenko really did discuss steps which would lead to a ceasefire between rebels and Ukrainian troops," Kremlin spokesman Dmitry Peskov was quoted as saying by the RIA-Novosti news agency.
"But in principle Russia cannot agree on a ceasefire as it is not a participant in the conflict."
About an hour earlier, Ukraine's President Petro Poroshenko announced that he and Mr Putin had agreed to a permanent truce.
A statement released by President Poroshenko said the leaders had agreed to a 'permanent ceasefire' for the region. This was later amended.
"The conversation resulted in an agreement on ceasefire regime in the Donbas," the statement read.
"The parties reached mutual understanding on the steps that will facilitate the establishment of peace."
Earlier in the day, Mr Peskov said the leaders found they "largely share" the same views on how to stop the violence in east Ukraine.
"The heads of state exchanged opinions about what needs to be done first in order to bring an end to the bloodletting in the southeast of the country as soon as possible," he told Russian news agencies.
"The views of the presidents of the two countries about possible ways out of this difficult crisis overlap to a considerable degree."
The pair met last week in Minsk but made no progress towards ending the conflict, which has intensified in recent weeks.
Western nations have accused Russia of deploying troops in Ukraine, but Moscow have repeatedly denied these claims.
The talks come as Australian Prime Minister Tony Abbott announced Australia is banning uranium sales to Ukraine and opening an embassy in Kiev.
Mr Abbott also said the government is considering sending support to Ukraine through aid and non-lethal military assistance.
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