A group of masked men issued a chilling warning to Jews living in eastern Ukraine this week: register with the government, or face deportation. According to reports from local and Israeli media, the men were seen outside a synagogue in the city of Donetsk on Wednesday, where they were handing out leaflets to people leaving a Passover service. Written on the papers were orders for all Jews over the age of 16 to register their names and property with a governmental office, and to provide documents to register your Jewish religion. The identities of the men remain unknown, and its not clear whether they are affiliated with a particular movement or political party.