On Sunday, Ukraine claimed it had recaptured the police station in Luhansk, which had been under the control of pro-Russian separatists for months. They raised the Ukrainian flag over the station, though a separatist official in Donetsk told Reuters she did not know what had happened and would not confirm the loss. It marked a potential breakthrough for the Ukrainian government in fully defeating the rebels. While Ukraine claimed victory, it also claimed that the supply of weapons and fighters from Russia has only accelerated. Officials in Moscow have denied this accusation. Foreign ministers from Ukraine and Russia are set to begin diplomatic talks in Berlin on Sunday.