He said this, opening the 23d session of the Council of Foreign Ministers of the Organization for Security and Cooperation in Hamburg on Thursday morning, an Ukrinform correspondent reported from Germany.
"The agreement on ceasefire is constantly violated. I consider that situation in eastern Ukraine is unacceptable," the OSCE chairman said.
Steinmeier expressed his gratitude to the OSCE observers. He assured that the observers were ready to continue monitor the process of withdrawal of weapons, especially heavy, from the contact line.