US Special Representative for Ukraine Kurt Volker has tweeted he is going to visit eastern Ukraine next week.
This will be his seventh visit to Ukraine since he assumed the role eight months ago.
His last visit took place in January.
Earlier, Ukrainian President Petro Poroshenko said that Volker would visit Ukraine on Monday, 14 May.
Volker recently called for stricter sanctions against Russia. He noted that the US sanctions had not had the desired effect on Russian policy and that Moscow was likely to proceed with its intentions.