Several campaign staffers and volunteers for disqualified Russian presidential candidate Boris Nadezhdin have been arrested.
A second line of fortifications are being built in the Kharkiv region.
Russian forces managed to capture major cities in the Kharkiv region early in the invasion, including Izyum, Kupiansk and Balakliia.
However, a Ukrainian counteroffensive saw most of the settlements in Kharkiv returned to Ukrainian control.
