Kremlin Spokesman Dmitry Peskov said on Thursday that any negotiations on Ukraine without Russia were meaningless.

"We have repeatedly said that negotiations without Russia were meaningless... President Putin has repeatedly emphasized that we remain open to the negotiation process," Peskov said.

The Swiss government will host a two-day high-level conference in June aimed at achieving peace in Ukraine, it said on Wednesday, although Russia has made clear it will not take part in the initiative. (Reporting by Reuters; editing by Guy Faulconbridge)