CCTV of anti-Semitic leaflets being handed out in Ukraine
18 April 2014 Last updated at 20:20 BST
The chief rabbi of the eastern region of Donbass has called on Ukranian security services to protect the Jewish community after men in balaclavas distributed threatening leaflets outside the synagogue.
About 15,000 Jews live in Donetsk; the leaflets many of them received were signed by the pro-Russian group People's Republic of Donetsk but the group say the letter is a fake and is designed to discredit Moscow's supporters.
The BBC has obtained CCTV footage that shows how leaflets were distributed.
Natalia Antelava reports from Donetsk.