Kremlin aide Yuri Ushakov said on Thursday that a proposal for a 30-day ceasefire in Ukraine backed by the US and Ukraine needed to be reworked to take account of Russia's own interests, the RIA state news agency reported.

"The document, it seems to me, has a hasty character... It will be necessary to work, think, and take into account our position, too. It outlines only the Ukrainian approach," RIA cited Ushakov as saying.