One of the eight European observers being detained by pro-Russian separatists in the eastern Ukraine city of Slaviansk was escorted to an Organisation for Security and Cooperation in Europe (OSCE) vehicle and driven away, according to Reuters.
Stella Khorosheva, a spokeswoman for the separatist mayor of Slaviansk, said the observer who left is a Swedish national. "He has a mild form of diabetes and so we decided to let him go," she told reporters.
According to the spokeswoman, he would be the only observer to be released on Sunday.
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If approved the increase would trigger a county-wide referendum.