Ukraine's positions at the peace talks with Russia remain unchanged, Ukrainian Presidential Advisor Mykhailo Podolyak said on Friday.

"Our positions remain unchanged: a ceasefire, the withdrawal of troops and strict security guarantees with specific formulas," Podolyak, who is also a member of the Ukrainian delegation to the peace talks with Russia, tweeted.

The fourth round of negotiations between Ukrainian and Russian delegations started on Monday via video link.

On Wednesday, Podolyak said that Ukrainian President Volodymyr Zelensky may hold talks with his Russian counterpart Vladimir Putin in the coming days.