Some 70% of the Russian troops believed to have been in Ukraine have withdrawn back across the border, Ukrainian President Petro Poroshenko said, according to the national news agency Ukrinform.
"This is another hope that peaceful initiatives have a good perspective," Poroshenko is quoted as saying during a Cabinet meeting in Kiev on Wednesday.
The remarks came several days into a shaky ceasefire deal between Ukrainian forces and pro-Russia rebels.
Moscow has repeatedly denied sending any Russian troops over the border into Ukraine.
See more on this developing story at CNN.com