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DONETSK, Ukraine — Men in the uniforms of Ukraine’s now-defunct riot police on Saturday occupied police headquarters in Donetsk, the eastern city that is one of the flashpoints of a wave of pro-Russia protests, hours after armed men seized local police headquarters and a local branch of the Security Service in a nearby city.
Interior Minister Arsen Avakov described the unrest as ‘‘Russian aggression’’ and said Ukraine’s security officials would be gathering for an extraordinary meeting late Saturday evening.
The unrest in Donetsk and the city of Slovyansk were the latest shows of anger in eastern Ukraine, which has a large Russian-speaking population and was also the support base for Viktor Yanukovych, the Ukrainian president who was ousted in February after months of protests in Kiev.