Ukrainian presidential adviser Mykhailo Podolyak said in televised remarks that consultations were "ongoing" on a potential roadmap to peace, but added that a sticking point remains the number of countries that would act as security guarantors for Ukraine.

Read here 197 children killed in Russia's war on Ukraine

"Consultations on what legal obligations need to be made, how it will be in terms of a multilateral treaty are ongoing now," he said in televised remarks.

Podolyak added: "We have to understand that the Russians categorically do not want to increase the number of countries that can be guarantors of security. It is important for us to have as many of those countries as possible."

Potential Putin-Zelensky summit

The condition for a possible meeting between Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky is an agreement document ready for the two leaders to sign, the Kremlin said Thursday.

“In principle, Putin never refused such a meeting, but certain conditions must be prepared for it, namely, the text of the [agreement] document [to sign],” Peskov told reporters on a regular conference call.

For the time being, there are no updates to report here, Peskov added.