German Chancellor Angela Merkel urged Russian President Vladimir Putin to help defuse the crisis in Ukraine and halt the stream of weapons and armed personnel into the country, her office said in a statement.
Speaking to Mr Putin on phone, she also expressed her hope that a convoy of aid would reach its target quickly, in order to stop people's suffering.
The chancellor expressed her concern about the situation in the east of Ukraine. In view of the need for an urgent ceasefire she urged the president to help de-escalate the situation and in particular to halt the stream of weapons, military advisers and armed personnel into Ukraine.
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Thousands of fans - who could not fit inside the cathedral - listened to proceedings from outside.