German Chancellor Angela Merkel says Russia has a duty to exert influence on pro-Russian separatists in eastern Ukraine.
Merkel made the remark during a phone call with Russian President Vladimir Putin on October 1.
According to a German government spokesman, the two leaders expressed concern that violence was still being used in Ukraine every day.
Merkel said the border between Ukraine and Russia needed to be monitored and the Organisation for Security and Cooperation (OSCE) had a big role to play in that.
She said Germany would continue to support the OSCE mission in Ukraine, adding that it could play an important role in planned local elections in the regions around Donetsk and Luhansk.