Merkel asks Putin to help free OSCE observers

Merkel asks Putin to help free OSCE observers

"Both sides noted the importance of utilizing the mediating potential of the OSCE across Ukraine to the maximum degree," the statement added, and said the call was initiated by Merkel.

The captured OSCE observers were shown to reporters on Sunday. One was previously released for health reasons, while others said they were in good health. A rebel leader told the media that they were "prisoners of war," and NATO spies.

During their conversation on Thursday, Putin told Merkel that the withdrawal of Ukrainian military units from the south-east of the country, ending violence and launching a national dialogue, "are key issues."