"I do not rule out an international phone call tomorrow, of which we will inform you further," Peskov said late Tuesday.
Earlier media reports suggested September 9 as the date for the next telephone conversation between the Russian, German, French and Ukrainian leaders under the so-called Normandy framework.
The quartet brokered a ceasefire deal in east Ukraine earlier this year.
Peskov had said earlier that there was a possibility for a Normandy format meeting sometime in the future, but said the issue would only be clarified after a telephone conversation between the four leaders.
Denis Pushilin, a DPR envoy, said that the security sub-group may also meet on Wednesday to discuss the withdrawal of weapons under 100-mm in caliber from the contact line. He affirmed the group’s commitment to find consensus on the issue for the sides to sign a document on the new arms withdrawal.
The special representative of the Organization for Security and Co-operation in Europe (OSCE), Martin Sajdik, said the political sub-group will meet in a two-day session starting next Tuesday.